Ilwu v. NLRB ( 2020 )


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  •                FOR PUBLICATION
    UNITED STATES COURT OF APPEALS
    FOR THE NINTH CIRCUIT
    INTERNATIONAL LONGSHORE AND         No. 19-70297
    WAREHOUSE UNION;
    INTERNATIONAL LONGSHORE AND          NLRB Nos.
    WAREHOUSE UNION, LOCAL 4,           19-CC-092816
    Petitioners,   19-CC-115273
    19-CD-092820
    v.                   19-CD-115274
    NATIONAL LABOR RELATIONS
    BOARD,
    Respondent,
    INTERNATIONAL BROTHERHOOD OF
    ELECTRICAL WORKERS, LOCAL 48;
    KINDER MORGAN TERMINALS,
    Intervenors.
    2                    ILWU V. NLRB
    NATIONAL LABOR RELATIONS                 No. 19-70604
    BOARD,
    Petitioner,         NLRB Nos.
    19-CC-092816
    v.                       19-CC-115273
    19-CD-092820
    INTERNATIONAL LONGSHORE AND              19-CD-115274
    WAREHOUSE UNION;
    INTERNATIONAL LONGSHORE AND
    WAREHOUSE UNION, LOCAL 4,
    Respondents.
    PACIFIC MARITIME ASSOCIATION,            No. 19-71471
    Petitioner,
    NLRB Nos.
    v.                       19-CC-092816
    19-CC-115273
    NATIONAL LABOR RELATIONS                 19-CD-092820
    BOARD,                                   19-CD-115274
    Respondent.
    OPINION
    On Petition for Review of an Order of the
    National Labor Relations Board
    Argued and Submitted September 2, 2020
    Seattle, Washington
    Filed October 14, 2020
    ILWU V. NLRB                                3
    Before: Michael Daly Hawkins and M. Margaret
    McKeown, Circuit Judges, and Virginia M. Kendall, *
    District Judge.
    Opinion by Judge Hawkins
    SUMMARY **
    Labor Law
    The panel granted petitions for review, denied the
    National Labor Relations Board’s cross-petition for
    enforcement, and remanded for further proceedings in an
    intra-union dispute over the right to perform certain
    maintenance and repair (“M&R”) work for Kinder Morgan
    Terminals at its Bulk Terminal facility in Vancouver,
    Washington.
    In 2008, Local 4 of the International Longshore and
    Warehouse Union and the Pacific Maritime Association
    (“PMA”) negotiated a collective bargaining agreement
    (CBA) in which PMA agreed to expand Longshoremen’s
    jurisdiction to include additional work at facilities run by
    PMA members. Kinder Morgan, a PMA member, had
    previously subcontracted the electrical M&R work at its
    Vancouver facility to a company that employed electricians
    represented by Local 48 of the International Brotherhood of
    *
    The Honorable Virginia M. Kendall, United States District Judge
    for the Northern District of Illinois, sitting by designation.
    **
    This summary constitutes no part of the opinion of the court. It
    has been prepared by court staff for the convenience of the reader.
    4                     ILWU V. NLRB
    Electrical Workers. The Longshoremen filed several
    grievances to enforce the new CBA when Kinder Morgan
    continued using Electrical Workers even after the CBA took
    effect. Kinder Morgan asked the Board to intervene.
    Agency and arbitral decisions ensued. Following a 2011
    hearing under section 10(k) of the National Labor Relations
    Act (the “NLRA”), the Board awarded the disputed work to
    the Electrical Workers over the Longshoremen’s defense
    that they were preserving work secured under the CBA.
    The Longshoremen and PMA sought review of the
    Board’s order rejecting the Longshoremen’s work
    preservation defense, finding the Longshoremen in violation
    of the NLRA, and ordering them to cease all attempts to
    obtain the disputed work, to withdraw its grievances, and to
    request vacatur of their favorable arbitral award.
    The panel reaffirmed the well-settled rule that 10(k)
    decisions are not res judicata in subsequent unfair labor
    practice proceedings. The panel held, therefore, that the
    Board erred in deeming its 10(k) decision dispositive of the
    Longshoremen’s work preservation doctrine.
    The panel rejected the Board’s construction of the work
    preservation defense. The panel noted that the Supreme
    Court has disallowed a narrow focus on past performance of
    the precise work in dispute as ill-suited to a holistic,
    circumstantial inquiry required here where the parties have
    agreements aimed at preserving union jobs in the face of
    technological threats to traditional union work. The panel
    held that the Board erred by disregarding this binding
    precedent and instead making past performance of the
    specific work at issue the beginning and end of its analysis.
    ILWU V. NLRB                        5
    The panel held that the 2008 CBA encompassed the
    disputed work which both unions claimed. The panel further
    held that the plain language of the CBA unambiguously
    assigned to the Longshoremen all M&R work, on all present
    and future stevedore cargo handling—including its
    technological equipment and electronics—for all PMA
    members, at all West Coast ports. The panel held that the
    Board erred by using extrinsic evidence to inject ambiguity
    into the CBA’s unambiguous terms and, by extension,
    assessing the Longshoremen’s work preservation defense
    based on that erroneous construction.
    COUNSEL
    Eleanor Morton (argued) and Lindsay R. Nicholas, Leonard
    Cardner     LLP,    San   Francisco,     California,   for
    Petitioners/Cross-Respondents International Longshore and
    Warehouse Union, and International Longshore and
    Warehouse Union, Local 4.
    Michael E. Kenneally (argued) and Jonathan C. Fritts,
    Morgan Lewis & Bockius LLP, Washington, D.C., for
    Petitioner Pacific Maritime Association.
    Heather S. Beard (argued), Attorney; Kira Dellinger Vol,
    Supervisory Attorney; David Habenstreit, Assistant General
    Counsel; Meredith Jason, Acting Deputy Associate General
    Counsel; Alice B. Stock, Deputy General Counsel; Peter B.
    Robb, General Counsel; National Labor Relations Board,
    Washington, D.C.; for Respondent.
    Elizabeth Joffe (argued), McKanna Bishop Joffe LLP,
    Portland, Oregon, for Intervenor International Brotherhood
    of Electrical Workers, Local 48.
    6                         ILWU V. NLRB
    David L. Schenberg and Timothy A. Garnett, Ogletree
    Deakins Nash Smoak & Stewart P.C., St. Louis, Missouri,
    for Intervenor Morgan Kinder.
    Kevin Marrinan and John P. Sheridan, Marrinan & Mazzola
    Mardon P.C., New York, New York, for Amicus Curiae
    International Longshoremen’s Association, AFL-CIO.
    Robert H. Lavitt, Barnard Iglitzin & Lavitt LLP, Seattle,
    Washington, for Amici Curiae Maritime Union of Australia,
    and International Transport Workers’ Federation.
    OPINION
    HAWKINS, Circuit Judge:
    We address a years-long intra-union dispute over the
    right to perform certain maintenance and repair (M&R) work
    for Kinder Morgan Terminals (Kinder Morgan) at its Bulk
    Terminal facility in Vancouver, Washington. In 2008, Local
    4 of the International Longshore and Warehouse Union (the
    Longshoremen) 1 and the Pacific Maritime Association
    (PMA), an association of West Coast port operators,
    negotiated a collective bargaining agreement (CBA) with the
    Longshoremen in which they agreed to offset anticipated
    future losses of longshore jobs to automation by expanding
    the Longshoremen’s jurisdiction to include additional work
    at facilities run by PMA members. One such member,
    Kinder Morgan, had previously subcontracted the electrical
    1
    The union’s international organization is also a Petitioner. Since
    their differences are immaterial here, and for ease of reference, we refer
    to them collectively as “the Longshoremen” and to their members as
    “Longshoremen.”
    ILWU V. NLRB                                  7
    M&R work at its Vancouver facility to a company that
    employed electricians represented by Local 48 of the
    International Brotherhood of Electrical Workers (the
    Electrical Workers). 2 Relying on CBA language that
    covered the work in question, the Longshoremen filed
    several grievances to enforce the new CBA when Kinder
    Morgan continued using Electrical Workers even after the
    agreement took effect. When the Electrical Workers
    responded by threatening to picket the Vancouver facility,
    Kinder Morgan asked the National Labor Relations Board
    (the Board) to intervene.
    A cacophony of agency and arbitral decisions ensued.
    Following a 2011 hearing under section 10(k) of the
    National Labor Relations Act (NLRA), 
    29 U.S.C. § 160
    (k),
    the Board awarded the disputed work to the Electrical
    Workers over the Longshoremen’s defense that they were
    preserving work secured under the new CBA. Meanwhile,
    the arbitrator assigned to the Longshoremen’s grievances
    found as a matter of contract interpretation that the CBA
    covered the disputed work. As the Longshoremen took steps
    to enforce their arbitral victory, the Electrical Workers filed
    unfair labor practices (ULP) charges, and the Board filed a
    complaint alleging that the Longshoremen’s continued
    pursuit of the disputed work violated section 8(b)(4) of the
    NLRA, 
    29 U.S.C. § 158
    (b)(4). In 2014, an administrative
    law judge (ALJ), after a seven-day hearing, found the
    Longshoremen’s actions were aimed at preserving
    bargained-for work and dismissed the complaint.
    Five years later, the Board disagreed. Reversing the
    ALJ, the Board again rejected the Longshoremen’s work
    2
    In addition to referring to the union organization as “the Electrical
    Workers,” we similarly refer to its members as “Electrical Workers.”
    8                          ILWU V. NLRB
    preservation defense, found them in violation of the NLRA,
    and ordered them to cease all attempts to obtain the disputed
    work, to withdraw its grievances, and to request vacatur of
    their favorable arbitral award. The Longshoremen and
    PMA 3 now seek review of this order, and, in a counter-
    petition, the Board seeks its enforcement. 4
    We resolve three issues here. First, we reaffirm the well-
    settled rule that 10(k) decisions are not res judicata in
    subsequent ULP proceedings. Indeed, our and the Board’s
    own case law expressly allow parties in ULP proceedings to
    relitigate arguments previously rejected in 10(k) decisions.
    We therefore hold that the Board erred in deeming its 10(k)
    decision “dispositive” of the Longshoremen’s work
    preservation defense. Second, we reject the Board’s
    construction of the work preservation defense. The Supreme
    Court has twice disallowed such a narrow focus on past
    performance of the precise work in dispute as ill-suited to
    the holistic, circumstantial inquiry that is indispensable
    where, as here, parties strike agreements aimed at preserving
    union jobs in the face of technological threats to traditional
    3
    We previously denied without prejudice the Board’s motion to
    dismiss PMA’s petition because it was not a party to the underlying
    proceedings. The Board has since conceded the petition’s timeliness and
    declined to renew its motion “because PMA makes essentially the same
    arguments as ILWU, which undisputably has standing.” We do not
    address it further.
    4
    On July 2, 2019, we consolidated the Longshoremen’s and PMA’s
    petitions for review and the Board’s cross-petition for enforcement—all
    of which arise from the same Board order. We also granted Kinder
    Morgan and the Electrical Workers leave to intervene, and each has filed
    a brief in support of the Board’s cross-petition. Finally, we granted leave
    to the Maritime Union of Australia and the International
    Longshoremen’s Association, AFL-CIO, to participate as amici, and
    each has filed an amicus brief in support of the petitions for review.
    ILWU V. NLRB                          9
    union work. We hold that the Board erred by disregarding
    this binding precedent and instead making past performance
    of the specific work at issue the beginning and end of its
    analysis. Third, we hold that the 2008 CBA encompasses
    the disputed work which both unions claim. Subject only to
    exceptions not at issue here, the plain language of the
    agreement unambiguously assigns to the Longshoremen all
    M&R work, on all present and future stevedore cargo
    handling equipment—including its technological equipment
    and electronics—for all PMA members, at all West Coast
    ports. The Board erred by using extrinsic evidence to inject
    ambiguity into the CBA’s unambiguous terms and, by
    extension, assessing the Longshoremen’s work preservation
    defense based on that erroneous construction.
    Accordingly, we grant the petitions for review, deny the
    cross-petition for enforcement, vacate the Board’s order, and
    remand for further proceedings.
    BACKGROUND
    The Longshoremen and PMA have a decades-long
    collective bargaining relationship. Int’l Longshoremen’s &
    Warehousemen’s Union (Cal. Cartage), 
    208 NLRB 986
    ,
    987 (1974). The Longshoremen have represented a
    coastwide collective bargaining unit of longshore workers at
    West Coast ports since 1938. Shipowners’ Ass’n of the Pac.
    Coast, 
    7 NLRB 1002
    , 1025 (1938). As a multiemployer
    association whose members, including Kinder Morgan,
    employ Longshoremen at ports along the West Coast, PMA
    is responsible for negotiating and administering CBAs on its
    members’ behalf. Kinder Morgan operates marine terminals
    at several West Coast ports, including its Vancouver facility,
    which it has operated since the 1990s. Int’l Brotherhood of
    Elec. Workers, Local 48 (IBEW), 
    357 NLRB 2217
    , 2217
    (2011).
    10                    ILWU V. NLRB
    Virtually all longshore work at West Coast ports is
    covered by a single CBA called the Pacific Coast Longshore
    Contract Document (PCLCD). Most relevant for our
    purposes is the version negotiated in 2008—specifically, its
    terms addressing the anticipated introduction of labor-saving
    automation technologies at West Coast ports. The language
    in section 1.71 of the agreement remained the same as in
    previous iterations, providing that the PCLCD “shall apply
    to the maintenance and repair of all stevedore cargo handling
    equipment.” The parties then added two new provisions. In
    section 1.72, the Longshoremen and PMA stipulated:
    It is recognized that the introduction of new
    technologies, including fully mechanized and
    robotic-operated        marine        terminals,
    necessarily displaces traditional longshore
    work and workers, including the operating,
    maintenance and repair, and associated
    cleaning of stevedore cargo handling
    equipment. The parties recognize robotics
    and other technologies will replace a certain
    number of equipment operators and other
    traditional longshore classifications. It is
    agreed that the jurisdiction of the ILWU shall
    apply to the maintenance and repair of all
    present and forthcoming stevedore cargo
    handling equipment in accordance with
    Sections 1.7 and 1.71 and shall constitute the
    functional equivalent of such traditional
    ILWU work.
    And in section 1.73, they further agreed that
    [t]he scope of work shall include . . .
    maintenance and repair . . . of all present and
    ILWU V. NLRB                               11
    forthcoming technological equipment related
    to the operation of stevedore cargo handling
    equipment (which term includes containers
    and chassis) and its electronics, that are
    controlled or interchanged by PMA
    companies, in all West Coast ports.
    Simply put, the parties decided that PMA members could
    increase their use of automated equipment, and in exchange,
    the Longshoremen’s jurisdiction would expand to offset the
    corresponding loss of traditional longshore work. 5
    This case emanates from conflicting constructions of
    these new terms—specifically, whether they encompass the
    disputed work at Kinder Morgan’s Vancouver facility.
    Before 2008, Kinder Morgan had subcontracted such work
    to a subcontractor which employed workers under its own
    CBA with the Electrical Workers. See ILWU, 
    367 NLRB 5
    For PMA members that already had contracts with other unions,
    Section 1.81 of the PCLCD states that
    ILWU jurisdiction of maintenance and repair work
    shall not apply at those specific marine terminals that
    are listed as being “red-circled” in the July 1, 2008
    Letter of Understanding on this subject. Red-circled
    facilities, as they are modified/upgraded (e.g.,
    introduction of new technologies), or expanded, while
    maintaining the fundamental identity of the pre-
    existing facility, shall not result in the displacement of
    the recognized workforce and shall not be disturbed,
    unless as determined by the terminal owner or tenant.
    Since the Board found that the 2008 PCLCD does not encompass the
    disputed work, it did not decide whether Section 1.81 excludes electrical
    M&R work performed at Kinder Morgan’s Vancouver facility from the
    Longshoremen’s jurisdiction. See Int’l Longshore & Warehouse Union
    (ILWU), 
    367 NLRB No. 64
     (Jan. 31, 2019).
    12                       ILWU V. NLRB
    No. 64, slip op. at 2. When this arrangement continued
    beyond the 2008 PCLCD’s operational date, the
    Longshoremen filed several grievances arguing that Kinder
    Morgan’s use of Electrical Workers violated sections 1.71
    through 1.73 of the agreement. The Longshoremen’s local
    president also penned a letter demanding that Kinder
    Morgan hire Longshoremen to perform the disputed work.
    The Electrical Workers responded by threatening to picket
    the Vancouver facility if Kinder Morgan capitulated to the
    Longshoremen’s demands. 6 Caught in the middle, Kinder
    Morgan then filed charges against the Electrical Workers
    with the Board and requested a 10(k) hearing, see 
    29 U.S.C. § 160
    (k).
    On December 31, 2011, the Board issued its 10(k)
    determination. After a three-day hearing and briefing from
    Kinder Morgan, the Electrical Workers, and the
    Longshoremen, the Board awarded the disputed work to the
    Electrical Workers. IBEW, 357 NLRB at 2221. Citing the
    unions’ competing claims to the same work, the Electrical
    Workers’ use of picketing threats against Kinder Morgan,
    and the absence of an agreed-upon method to resolve the
    dispute, the Board made its threshold finding of a bona fide
    jurisdictional dispute. 
    Id. at 2218
    . It then rejected the
    Longshoremen’s defense that they had acted lawfully to
    preserve work bargained for under the 2008 PCLCD. The
    Board instead noted the disputed work’s past performance
    6
    The Longshoremen and PMA question the sincerity of the
    Electrical Workers’ picketing threats by claiming that Kinder Morgan
    and the Electrical Workers concocted a superficially jurisdictional
    dispute to invite Board intervention. The Board twice rejected, and the
    ALJ did not consider, this argument. See IBEW, 357 NLRB at 2218;
    ILWU, 
    367 NLRB No. 64
    , slip op. at 5 n.6. Because we vacate the
    Board’s order based on antecedent legal errors, we, too, decline to
    address it.
    ILWU V. NLRB                              13
    by Electrical Workers, a concomitant lack thereof by the
    Longshoremen, and an absence of contractual language
    explicitly assigning electrical maintenance work to the
    Longshoremen. 
    Id.
     at 2218–19. It then discounted the
    language in sections 1.71 through 1.73 as too “general” to
    support the work’s reassignment to the Longshoremen,
    credited Kinder Morgan’s preference for Electrical Workers,
    dismissed the Longshoremen’s evidence of past
    performance of electrical M&R work as too sparse, noted
    Electrical Workers’ superior skills and training, and thus
    deemed their continued use more economical. 
    Id.
     at 2219–
    20.
    The Area Arbitrator assigned to the Longshoremen’s
    earlier-filed grievances reached the opposite conclusion. 7
    On February 21, 2012, the arbitrator issued an award finding
    that the Longshoremen’s jurisdiction under the 2008
    PCLCD encompasses the disputed work and referred the
    matter to the Coast Labor Relations Committee (CLRC),
    which ordered Kinder Morgan to “take the necessary steps
    to assign the work in dispute” to Longshoremen. Over the
    next several months, Kinder Morgan and the Longshoremen
    worked with the CLRC to implement the order, including
    preparing job postings for the work in question and
    interviewing Longshoremen candidates. While that was
    being accomplished, Kinder Morgan continued sending the
    work to its subcontractor and its Electrical Workers, to
    which the Longshoremen responded by physically
    7
    The designated Area Arbitrator had originally found that a July 28,
    2008 Letter of Understanding (LOU) exempted Kinder Morgan’s
    Vancouver facility from the relevant provisions of the PCLCD. On
    appeal, however, the Coast Arbitrator concluded that the LOU included
    no such exemption and remanded to the Area Arbitrator.
    14                       ILWU V. NLRB
    obstructing Electrical Workers’ access to the Vancouver
    facility.
    On November 8, 2012, the Electrical Workers went back
    to the Board and filed ULP charges against the
    Longshoremen. On June 28, 2013, 8 the Board filed a
    complaint alleging that the Longshoremen’s actions violated
    section 8(b)(4) of the NLRA, 
    29 U.S.C. § 158
    (b)(4). The
    Board based its allegations on the Longshoremen’s failure to
    withdraw its grievances, its efforts to enforce its favorable
    arbitral award, and its attempts to prevent Electrical Workers
    from performing electrical M&R work at Kinder Morgan’s
    Vancouver facility.
    An ALJ dismissed the complaint on August 13, 2013.
    Following a seven-day hearing, the ALJ found that
    (1) Longshoremen had previously performed electrical
    M&R work at “numerous” PMA-affiliated facilities;
    (2) contrary to the Board’s 10(k) decision, the 2008 PCLCD
    encompasses both present and future electrical M&R work,
    including the disputed work here; (3) the work preservation
    doctrine recognizes the validity of such agreements; and
    (4) Kinder Morgan, as a PMA member, is bound by its
    terms.
    The Board disagreed. On January 31, 2019, it reversed
    the ALJ’s dismissal and found that the Longshoremen’s use
    of the grievance process and physical obstruction of jobsites
    constituted ULP under the NLRA. The Board began by
    stating that its initial 10(k) decision precluded the
    Longshoremen from reasserting its work preservation
    defense against the ULP charges. It also rejected the ALJ’s
    8
    After amending its complaint several times, the Board filed the
    operative consolidated complaint on October 22, 2013.
    ILWU V. NLRB                                15
    finding of past performance of the disputed work by
    Longshoremen, as well as the ALJ’s constructions of the
    PCLCD and the work preservation doctrine. The Board then
    ordered the Longshoremen to cease and desist from said
    activities, to withdraw its grievances against Kinder Morgan,
    and to request vacatur of the arbitrator’s decision concluding
    that the terms of the 2008 PCLCD encompass electrical
    M&R work.
    These petitions for review and cross-petition for
    enforcement followed. 9
    JURISDICTION AND STANDARD OF REVIEW
    We have jurisdiction to review the petitions and cross-
    petition under 
    29 U.S.C. § 160
    (e) and (f). We will enforce
    the Board’s order if it “correctly applied the law and if its
    factual findings are supported by substantial evidence in the
    record as a whole.” Plaza Auto Ctr., Inc. v. NLRB, 
    664 F.3d 286
    , 291 (9th Cir. 2011) (quotation marks omitted). While
    we accord the Board’s interpretations of the NLRA
    “considerable deference,” Recon Refractory & Constr., Inc.
    v. NLRB, 
    424 F.3d 980
    , 987 (9th Cir. 2005) (quotation marks
    omitted), its legal interpretations generally must follow
    Supreme Court and circuit case law, NLRB v. Ashkenazy
    Prop. Mgmt. Corp., 
    817 F.2d 74
    , 75 (9th Cir. 1987), and
    absent explanation, adhere to its own precedent, NLRB v.
    Great W. Produce, Inc., 
    839 F.2d 555
    , 557 (9th Cir. 1988).
    Substantial evidence supports a factual finding if a
    9
    The Longshoremen and PMA filed their petitions on February 1
    and June 13, 2019, respectively, and the Board filed its cross-petition on
    March 28, 2019.
    16                       ILWU V. NLRB
    reasonable juror could have reached the Board’s conclusion.
    Plaza Auto, 
    664 F.3d at 291
    .
    ANALYSIS
    Congress enacted the ULP provisions in section 8(b)(4)
    of the NLRA, 
    29 U.S.C. § 158
    (b)(4), to protect “neutral
    employer[s]” caught between competing unions. Nat’l
    Woodwork Mfrs. Ass’n v. NLRB, 
    386 U.S. 612
    , 625–26
    (1967). We limit our discussion to one of these provisions. 10
    Subsection (D) makes it a ULP for a union to threaten or
    coerce any person with the object of “forcing or requiring
    any employer to assign particular work to employees in a
    particular labor organization . . . rather than to employees in
    another labor organization.” 
    29 U.S.C. § 158
    (b)(4)(D).
    “Section 8(b)(4)(D), however, must be read in light of
    [section] 10(k) with which it is interlocked.” NLRB v.
    Plasterers’ Local Union No. 79, 
    404 U.S. 116
    , 123 (1971).
    If the Board has reasonable cause to believe section
    8(b)(4)(D) was violated, Int’l Tel. & Tel. Corp. v. Local 134,
    Int’l Brotherhood of Elec. Workers (ITT), 
    419 U.S. 428
    , 445
    n.16 (1975), section 10(k) “empower[s] and direct[s]” the
    Board “to hear and determine” the dispute unless the parties
    can timely demonstrate that “they have adjusted, or agreed
    upon methods for the voluntary adjustment of, the dispute.”
    
    29 U.S.C. § 160
    (k). This scheme encourages the swift, often
    10
    Although the underlying complaint alleges that the
    Longshoremen’s actions violated Section 8(b)(4)(ii)(B) and (D), the
    Board’s analysis focuses almost entirely on subsection (D), save for a
    two-sentence paragraph at the end stating that the same actions by the
    Longshoremen also violated subsection (B)’s secondary boycott
    prohibition. See ILWU, 
    367 NLRB No. 64
    , slip op. at 8. Because the
    latter finding depends entirely on the Board’s erroneous application of
    subsection (D), we do not address subsection (B) separately here.
    ILWU V. NLRB                          17
    informal resolution of disputes by giving the parties a sort of
    “advisory opinion” that previews the Board’s probable
    assessment of the merits before the long slog of formal ULP
    proceedings begins in earnest. ITT, 
    419 U.S. at 446
    ; see also
    
    id.
     at 441–47 (describing purpose, function, and limitations
    of 10(k) proceedings). It is not, however, a binding, final
    disposition. 
    Id. at 444
    .
    I. The Board’s 10(k) Decision Does Not Bar Re-
    Litigation of the Longshoremen’s Work Preservation
    Defense
    We begin with the Board’s determination that its 10(k)
    decision precluded the Longshoremen from reasserting their
    work preservation defense in the subsequent ULP
    proceeding. The Board found its prior decision “dispositive
    of the question whether the Longshoremen had a valid work
    preservation objective” and deemed the Longshoremen’s
    continued invocation of the defense an invalid attempt “to
    relitigate the Board’s assignment of the disputed electrical
    M&R work to IBEW-represented employees.” Though it
    now calls this finding “largely immaterial” given its
    purported reconsideration of the 10(k) decision later in the
    order, the Board still maintains that it “reasonably relied on
    precedent precluding such re-litigation.” Not as we see it.
    The Supreme Court has long held that “[t]he findings and
    conclusions in a [section] 10(k) proceeding are not res
    judicata on the unfair labor practice issue in the later
    [section] 8(b)(4)(D) determination.” ITT, 
    419 U.S. at 446
    .
    If a union does not follow the Board’s 10(k) decision, “the
    Board must prove [by a preponderance of the evidence] the
    union guilty of a [section] 8(b)(4)(D) violation before a
    cease-and-desist order can issue.” Plasterers’ Local, 
    404 U.S. at
    122 n.10. This typically entails revisiting some of
    the arguments rejected during a 10(k) proceeding, at which
    18                    ILWU V. NLRB
    time the Board need only have found reasonable cause to
    believe section 8(b)(4)(D) was violated before issuing an
    award. See id.; ITT, 
    419 U.S. at
    445 n.16. “Indeed,
    reconsideration of [section] 10(k) rulings appears implicitly
    contemplated by the statutory scheme, given that a [section]
    8(b)(4)(D) proceeding involves a full adversarial
    adjudication, in contrast with the informal proceedings
    required under [section] 10(k).” Pac. Maritime Ass’n v.
    NLRB (PMA), 
    827 F.3d 1203
    , 1211 (9th Cir. 2016).
    Board case law has long observed this anti-preclusion
    rule. See Longshoremen ILWU Local 6 (Golden Grain), 
    289 NLRB 1
    , 2 (1988) (“[W]e overrule prior Board cases to the
    extent they suggest that a respondent in an 8(b)(4)(D)
    proceeding is not entitled to relitigate factual issues
    concerning the elements of the 8(b)(4)(D) violation that were
    raised in an underlying 10(k) proceeding unless it presents
    new or previously unavailable evidence.”); accord Plumbers
    Local 290 (Streimer Sheet Metal Works), 
    323 NLRB 1101
    ,
    1101 n.3 (1997) (“In light of the Respondent’s election . . .
    to relitigate the unfair labor practice issue, we find no need
    to review the Board’s decision reached under a different
    evidentiary standard in the Sec. 10(k) proceeding.”); Tile,
    Marble, Terrazzo Finishers & Shopworkers, Local 47-T
    (Grazzini Bros.), 
    315 NLRB 520
    , 521 (1994) (“[A]
    respondent is entitled to a hearing . . . if the respondent
    denies the existence of an element of the 8(b)(4)(D)
    violation, either directly or by raising an affirmative
    defense.”); Teamsters Local 216 (Granite Rock Co.),
    
    296 NLRB 250
    , 250 (1989) (“[A] respondent may relitigate
    factual issues concerning the elements of the 8(b)(4)(D)
    violation that were raised in the underlying 10(k)
    proceeding.”). Yet the Board offered no explanation before
    it departed from that rule here. See Great W. Produce, 
    839 F.2d at 557
    . Nevertheless, that does not end our analysis.
    ILWU V. NLRB                          19
    Even as it has eschewed giving certain findings in 10(k)
    decisions res judicata effect, the Board has concurrently
    maintained that parties cannot “relitigate threshold matters
    that are not necessary to prove an 8(b)(4)(D) violation.”
    Golden Grain, 289 NLRB at 2 n.4. Albeit passingly, the
    Board seizes upon such language here by suggesting that it
    reasonably relied on this rule in barring re-litigation of the
    Longshoremen’s work preservation defense in the
    subsequent ULP proceedings. We disagree.
    The “threshold matters” mentioned in Golden Grain
    refer to the initial jurisdictional assessment. Indeed, the
    decision’s immediately subsequent reference to “the
    threshold issue of whether there had been an agreed method
    of settlement,” see 
    id.,
     points directly to the initial “three-
    step inquiry” used to determine whether there is a valid
    jurisdictional dispute warranting Board intervention under
    section 10(k), see Recon Refractory, 
    424 F.3d at 988
    . This
    threshold inquiry asks whether “(1) a union has used a
    proscribed means—such as picketing or threatening to
    picket—to enforce its claim to the work in dispute; (2) there
    are competing claims to the disputed work between rival
    groups of employees; and (3) there is no agreed-upon
    method for resolving the dispute voluntarily.” 
    Id.
     If the
    Board answers each of these in the affirmative, it then
    proceeds to the heart of the 10(k) inquiry by awarding the
    disputed work “based on considerations such as the
    employer’s past practice, industry custom, and contract
    rights.” 
    Id.
    This is not merely the most reasonable reading of a
    “threshold matters” exception, but the only one that rests
    within the bounds set by our previous decisions and those of
    the Supreme Court. See ITT, 
    419 U.S. at 446
    ; PMA,
    827 F.3d at 1211. Not so of the Board’s preferred approach,
    20                       ILWU V. NLRB
    which would effectively nullify Golden Grain’s distinction
    of some issues as “threshold” by converting the entire 10(k)
    process into a threshold inquiry, and by extension, creating
    an exception that swallows the anti-preclusion rule. See
    Ashkenazy Prop., 
    817 F.2d at 75
    .
    The Board fell into this very trap in Grazzini Brothers,
    upon which the Board now relies in defending its use of a
    more expansive exception. There, after acknowledging the
    anti-preclusion rule, the Board nevertheless granted
    dispositive weight to the findings supporting its earlier 10(k)
    award—in that instance, concerning the existence of a CBA
    between the respondent and the employer. 315 NLRB at
    521–22. Citing its “well settled” rule that a party cannot
    relitigate a 10(k) work assignment in a later ULP
    proceeding, 11 the Board announced that “[i]t logically
    follows that a party cannot relitigate the various factors,
    including the existence or nonexistence, of a collective-
    bargaining agreement, that the Board considers in making its
    10(k) determination.” Id. at 522. Addressing Golden
    Grain’s “threshold matters” exception in a footnote, the
    Board simply stated that barring re-litigation of the factors
    going to the merits of a 10(k) award “is consistent with the
    Board’s holding that it will not permit renewed litigation of
    threshold or preliminary matters not necessary to prove an
    8(b)(4)(D) violation.” Id. at 522 n.7. Not really.
    We begin by noting the rather breathtaking scope of such
    an exception. The entire 10(k) proceeding consists of two
    components: an initial jurisdictional finding and an award
    11
    Because Board case law explicitly excludes affirmative defenses
    from those “threshold matters” excepted under Golden Grain, we need
    not address the Board’s potentially narrower rule against relitigating
    10(k) work assignments.
    ILWU V. NLRB                         21
    based on considerations like past practice, industry custom,
    and CBAs. See Recon Refractory, 
    424 F.3d at 988
    . If, as
    Grazzini Brothers suggests, Golden Grain’s bar on
    relitigating “threshold matters” encompasses both parts, then
    the anti-preclusion rule loses all practical meaning. But that
    is not the case.
    Nothing in Golden Grain supports the more expansive
    “threshold matters” exception that the Board recognized in
    Grazzini Brothers and now relies upon here. To the
    contrary, Golden Grain and its progeny reinforce our stated
    view that the exception refers exclusively to the Board’s
    initial jurisdictional inquiry. See 289 NLRB at 2 n.4 (using
    “agreed upon method of settlement” inquiry as example of a
    “threshold matter”); Granite Rock Co., 296 NLRB at 250 n.2
    (same); Streimer Sheet Metal Works, 323 NLRB at 1103–04
    (“[W]hile I am bound by the Board’s 10(k) findings as to
    certain ‘threshold matters,’ I am nevertheless required to
    judge the lawfulness of the picketing in the light of the
    parties’ ‘relitigation’ during this trial of certain ‘factual
    issues concerning the elements of the [alleged] 8(b)(4)(D)
    violation,’ including their relitigation of certain matters as
    to which the Board made findings in the 10(k) decision, and
    on which the General Counsel now relies as evidence that
    the picketing had a ‘proscribed,’ work-reassignment
    ‘object.’”     (emphasis      added,    footnote    omitted));
    Architectural Metal Workers Local 513 (Custom
    Contracting), 
    292 NLRB 792
    , 793 (1989) (“The
    Respondent’s affirmative defense does not raise such purely
    preliminary or threshold matters. This would be the case had
    the Respondent asserted that the Employer did not meet the
    Board’s jurisdictional standards.”). Thus, even if we were
    to accept the Board’s claim that its 10(k) work assignments
    are unreviewable, see Grazzini Bros., 315 NLRB at 522, that
    presumption necessarily excludes those parts of the 10(k)
    22                        ILWU V. NLRB
    determination that go to the merits of subsequent ULP
    charges, including affirmative defenses like work
    preservation. See 
    id. at 521
     (“[A] respondent is entitled to a
    hearing . . . if the respondent denies the existence of an
    element of the 8(b)(4)(D) violation, either directly or by
    raising an affirmative defense.”).
    In sum, the Board’s expansion of the “threshold matters”
    exception in Grazzini Brothers and its later reliance on the
    same here find no support in the precedents of the Supreme
    Court, of this Court, or of the Board itself. And in neither
    instance did the Board either distinguish its finding from the
    anti-preclusion rule, see Ashkenazy Prop., 
    817 F.2d at 75
    , or
    explain its departure from the narrower construction
    advanced by the Golden Grain line of cases, see Great W.
    Produce, 
    839 F.2d at 557
    . We therefore hold that the Board
    erred in finding its 10(k) determination dispositive of the
    Longshoremen’s work preservation defense, and we
    overrule Grazzini Brothers to the extent it holds to the
    contrary. 12
    II. The Board’s Application of the Work Preservation
    Doctrine
    We turn next to the Board’s analysis of the
    Longshoremen’s work preservation defense. Unmoved by
    the Board’s preclusion argument, the ALJ proceeded to the
    merits and found that the Longshoremen’s negotiation of and
    12
    The Board also refused to consider the Longshoremen’s collusion
    argument, see supra note 5, based on the Board’s erroneous conclusion
    that its 10(k) determination precluded the issue’s reconsideration during
    the ULP proceedings. It did not, however, offer an alternative analysis
    of the argument as it did with the Longshoremen’s work preservation
    defense. We therefore decline to address the issue before remanding to
    the Board for consideration under the appropriate legal standard.
    ILWU V. NLRB                        23
    attempts to enforce the 2008 PCLCD had aimed “to limit the
    more recent outsourcing of unit jobs to nonunit employees
    in order to diminish these looming adverse consequences on
    unit employees who face the loss of the jobs they have been
    performing for years.” When the Board reversed, it followed
    its initial preclusion finding with an alternative analysis
    concluding that the ALJ had misconstrued the work
    preservation doctrine; that the relevant terms of the 2008
    PCLCD do not encompass the disputed work; and that only
    the electrical M&R work performed at Kinder Morgan’s
    Vancouver facility was relevant to the Longshoremen’s
    defense. This was also error.
    A valid work preservation objective provides a complete
    defense against alleged violations of section 8(b)(4)(D), as
    well as against jurisdictional disputes under section 10(k).
    See Nat’l Woodwork, 
    386 U.S. at
    644–46; Recon Refractory,
    
    424 F.3d at
    988–89. “The touchstone is whether the
    agreement or its maintenance is addressed to the labor
    relations of the contracting employer vis-à-vis his own
    employees.” Nat’l Woodwork, 
    386 U.S. at 645
    . “The effect
    of work preservation agreements on the employment
    opportunities of employees not represented by the union, no
    matter how severe, is of course irrelevant to the validity of
    the agreement so long as the union had no forbidden
    secondary purpose to affect the employment relations of the
    neutral employer.” NLRB v. Int’l Longshoremen’s Ass’n
    (ILA I), 
    447 U.S. 490
    , 507 n.22 (1980); accord The N.Y.
    Presbyterian Hosp., 
    354 NLRB 71
    , 77 (2009) (“[U]nions
    and employers are entitled to negotiate contracts that
    ‘preserve’ unit work by way of no-subcontracting or similar
    clauses, even if the enforcement of such agreements may
    cause the contracting employer to cease doing business with
    someone else.”). In a word, the dispositive measure is
    purpose, not effect.
    24                    ILWU V. NLRB
    A. The Board’s Doctrinal Framework
    The first friction point concerns the contours of the work
    preservation doctrine itself. Central to this dispute are the
    parties’ assessments of the Supreme Court’s elaboration of
    the doctrine in ILA I and NLRB v. International
    Longshoremen’s Association (ILA II), 
    473 U.S. 61
     (1985).
    The Longshoremen and PMA predictably prefer the ALJ’s
    view, which characterized these cases as a rejection of “the
    Board’s highly restrictive view that the work preservation
    doctrine is confined only to work traditionally performed by
    unit employees.” The Board meanwhile falls back on its
    own view that these cases examine only “one aspect of the
    work preservation doctrine—identifying the ‘work in
    controversy’ in a ‘complex case of technological
    displacement’”—and thus offer little assistance here. In fact,
    the ILA cases are not unlike this one.
    In ILA I, the Court began by reiterating a two-part test
    for determining whether a CBA provision constitutes a
    lawful work preservation agreement. The first part requires
    that the agreement “have as its objective the preservation of
    work traditionally performed by employees represented by
    the union.” ILA I, 
    447 U.S. at 504
    . The second provides that
    “the contracting employer must have the power to give the
    employees the work in question,” or rather, the “right of
    control.” 
    Id.
     “The rationale of the second test is that if the
    contracting employer has no power to assign the work, it is
    reasonable to infer that the agreement has a secondary
    objective, that is, to influence whoever does have such
    power over the work.” 
    Id.
     at 504–05.
    The sticking point in ILA I was the doctrine’s application
    in cases where, as here, “employees’ traditional work is
    displaced, or threatened with displacement, by technological
    innovation.” 
    Id. at 505
    . Because the union workers there
    ILWU V. NLRB                         25
    had never performed the precise work at issue at the precise
    location in question, the Board found that the union’s
    objective had been work acquisition rather than work
    preservation, and thus, secondary in nature. 
    Id. at 506
    . The
    Court disagreed. Since technology often alters altogether the
    way that work gets done, the Court explained that the
    doctrine “must also apply to situations where unions attempt
    to accommodate change while preserving as much of their
    traditional work patterns as possible.” 
    Id. at 506
    . Otherwise,
    only those agreements that “respond to change with
    intransigence” would be valid—something Congress had
    never intended. 
    Id.
    The Court instead advanced a more holistic approach to
    defining disputed work. That assessment requires “a careful
    analysis of the traditional work patterns that the parties are
    allegedly seeking to preserve, and of how the agreement
    seeks to accomplish that result under the changed
    circumstances created by the technological advance.” 
    Id. at 507
    . The greater the complexity, the broader the industrial
    and vocational scope of the analysis. 
    Id.
     But in all cases,
    the focus must be “on the work of the bargaining unit
    employees, not on the work of other employees who may be
    doing the same or similar work,” and on how the agreement
    attempts to preserve jobs impacted by the introduction of
    new technologies. 
    Id.
    Five years later, the Court in ILA II repudiated once more
    the Board’s preoccupation with “employees outside the
    bargaining unit.” 
    473 U.S. at 82
    . First, the Court familiarly
    renounced concerns with the “extra-unit effects” of an
    otherwise legitimately motivated agreement. 
    Id. at 79
    .
    There was no question that the union’s motive for executing
    the agreement was preserving its members’ jobs, and thus,
    no reasonable inference of aggrandizement was to be
    26                    ILWU V. NLRB
    gleaned from evidence of the agreement’s effects on others.
    
    Id.
     Second, the Court rejected the Board’s understanding
    that work eliminated by innovation cannot possibly be
    preserved. 
    Id.
     at 80–81. But as the Court observed, job
    elimination itself often forms the impetus for such
    agreements. 
    Id.
     Thus, the relevant inquiry must remain
    whether
    a union’s activity is primary or secondary—
    that is, whether the union’s efforts are
    directed at its own employer on a topic
    affecting employees’ wages, hours, or
    working conditions that the employer can
    control, or, instead, are directed at affecting
    the business relations of neutral employers
    and are “tactically calculated” to achieve
    union objectives outside the primary
    employer-employee relationship.
    
    Id. at 81
    .       Of course, the “preservation/acquisition
    dichotomy” might still, in certain cases, help to detect
    tactical agreements aimed at acquiring work even absent any
    threat of job losses. 
    Id.
     at 79 n.19. The Board’s error there
    was making acquisition a talisman. As happened here.
    Two compounding errors beset the Board’s work
    preservation analysis. It erred first by deeming the ILA cases
    inapplicable here.      Neither case suggests its work
    preservation framework should be reserved only for
    particularly complex cases of technological displacement.
    To the contrary, ILA I specifically contemplates its
    application to both the “simple case” and “more complex
    cases.” 
    447 U.S. at 507
    . “Whatever its scope,” the inquiry
    remains the same: focused on bargaining unit workers rather
    than non-unit workers currently doing the same or similar
    ILWU V. NLRB                        27
    work; unconcerned with the work’s precise location; and
    accommodative toward change (or even the threat of
    change), including the elimination of traditional work. See
    
    id. at 505
    , 507–08 & n.22; ILA II, 
    473 U.S. at
    79–82.
    The Board subsequently erred by limiting its work
    preservation inquiry to whether Longshoremen had
    historically performed electrical M&R work at Kinder
    Morgan’s Vancouver facility. The ILA cases underscore the
    primacy of the work preservation agreement’s purpose, even
    if its enforcement comes at a cost to extra-unit workers. For
    the ALJ, the terms of the PCLCD left little doubt about the
    Longshoremen’s intent—perhaps most notably, the parties’
    mutual anticipation of robotics- and other technology-
    inflicted displacements of existing longshore work under
    section 1.72. If the PCLCD indeed covers the disputed
    work, then it at least stands to reason that the Longshoremen
    sought the disputed work, not to achieve some unrelated
    union objective or to inflict harm on Electrical Workers or
    the subcontractor that employed them, but “to limit the more
    recent outsourcing of unit jobs to nonunit employees in order
    to diminish these looming adverse consequences on unit
    employees who face the loss of the jobs they have been
    performing for years.” See ILA II, 
    473 U.S. at
    79 n.19 (“An
    agreement bargained for with the objective of work
    preservation in the face of a genuine job threat . . . is not
    ‘acquisitive’ . . . even though it may have the incidental
    effect of displacing work that otherwise might be done
    elsewhere or not be done at all.”). The Board’s order does
    not mention this possibility, much less address it.
    Instead, the Board appears to have fallen “into the same
    analytical trap” about which the ILA cases warn. See ILA II,
    
    473 U.S. at 82
    . Its ULP order is preoccupied with the precise
    location of the disputed work and with those non-unit
    28                    ILWU V. NLRB
    employees who stood to lose work were it to enforce the
    Longshoremen’s (and PMA’s) interpretation of the PCLCD.
    See ILA I, 
    447 U.S. at
    506–08; ILA II, 
    473 U.S. at 79
    . So,
    too, of its initial 10(k) decision. See IBEW, 357 NLRB at
    2218–19. As a result, neither engages the fundamental
    inquiry of work preservation—namely, whether the
    Longshoremen negotiated and attempted to enforce the 2008
    PCLCD in pursuit of a primary or secondary purpose. See
    ILA II, 
    473 U.S. at 81
    . The Board instead employs the same
    “wooden application” of the preservation/acquisition
    dichotomy, wherein the Longshoremen’s purpose is
    presumed secondary once it is determined that
    Longshoremen have not performed the precise work in
    question, irrespective of the parties’ contractually enshrined
    aim of preempting automation-induced job losses. See ILA
    II, 
    473 U.S. at
    80 n.19; cf. 
    id.
     at 75–76 (secondary purpose
    possible where “union engaged in activity to reach out to
    monopolize jobs or acquire new job tasks when their own
    jobs are not threatened” (quotation marks omitted)). But that
    is not the rule.
    The ILA cases make clear that not all bargained-for work
    in a legitimate work preservation agreement must be work
    that was traditionally performed by that union’s workers.
    See 
    id.
     at 80–81 (“‘Elimination’ of work in the sense that it
    is made unnecessary by innovation is not of itself a reason to
    condemn work preservation agreements . . . to the contrary,
    such elimination provides the very premise for such
    agreements.”); ILA I, 
    447 U.S. at 506
     (doctrine applies
    “where unions attempt to accommodate change while
    preserving as much of their traditional work patterns as
    possible” (emphasis added)). To be sure, the acquisition of
    previously unperformed work may, in certain
    circumstances—for example, where union jobs have not
    been threatened, see ILA II, 
    473 U.S. at
    75–76, or where that
    ILWU V. NLRB                         29
    work is markedly different from the union’s traditional
    work, see 
    id.
     at 81—suggest a secondary purpose. The
    Board made no such finding here. Rather, it made prior
    performance of electrical M&R work at Kinder Morgan’s
    Vancouver facility a talisman, and in so doing, it eluded the
    “inferential and fact-based” inquiry that the doctrine
    requires. See 
    id. at 81
    .
    Simply put, the Board’s narrow work preservation
    analysis is incompatible with the Supreme Court’s holistic,
    circumstantial inquiry. We therefore hold that the Board
    erred in finding the ILA cases inapplicable here and instead
    making past performance and extra-unit effects the
    beginning and end of its analysis. The success of any work
    preservation defense here, however, depends upon one final,
    antecedent issue to which we now turn.
    B. The 2008 PCLCD Encompasses Electrical M&R
    Work
    The Longshoremen’s work preservation defense
    necessarily assumes that the disputed electrical M&R work
    is covered by the agreement it claims to defend. Otherwise,
    its grievance actions and attempts to physically prevent
    Electrical Workers from performing electrical M&R work
    for Kinder Morgan lose their inference of a primary
    objective. In its 10(k) decision, the Board concluded that the
    2008 PCLCD does not encompass electrical M&R work
    because its terms are “very general” and contain “no explicit
    mention of electrical work.” IBEW, 357 NLRB at 2219. It
    also found that the 2008 changes to the PCLCD anticipating
    automation-related displacement “were directed at new
    work to be based on the introduction of new technologies.”
    
    Id.
     The Board then deferred to these findings without
    offering any additional analysis in its ULP order. This, too,
    was error.
    30                    ILWU V. NLRB
    The Board and the intervenors overstate the deference
    owed to the Board’s contract interpretations. “Although the
    Board has occasion to interpret collective-bargaining
    agreements in the context of unfair labor practice
    adjudication, the Board is neither the sole nor the primary
    source of authority in such matters.” Litton Fin. Printing
    Div. v. NLRB, 
    501 U.S. 190
    , 202 (1991) (citation omitted);
    accord NLRB v. Dist. Council of Iron Workers, 
    124 F.3d 1094
    , 1098 (9th Cir. 1997) (de novo review of collective
    bargaining agreements). Courts and arbitrators fill that role.
    Litton, 
    501 U.S. at 202
    . We therefore owe no deference to
    the Board’s construction of CBAs. See Local Joint Exec.
    Bd. of Las Vegas v. NLRB, 
    540 F.3d 1072
    , 1078 (9th Cir.
    2008); accord Wilkes-Barre Hosp. Co. v. NLRB, 
    857 F.3d 364
    , 373 (D.C. Cir. 2017) (“[W]e owe no deference to the
    Board’s interpretation of a disputed collective bargaining
    agreement.” (citation omitted)). We instead construe such
    agreements “according to ordinary principles of contract
    law” unless federal labor policy dictates otherwise. M & G
    Polymers USA, LLC v. Tackett, 
    574 U.S. 427
    , 435 (2015).
    As with all contracts, the intent of the parties is
    paramount. 
    Id.
     And in this case, that inquiry begins and
    ends with the plain language of the 2008 PCLCD. See 
    id.
    (“Where the words of a contract in writing are clear and
    unambiguous, its meaning is to be ascertained in accordance
    with its plainly expressed intent.” (quotation marks
    omitted)).
    Section 1.71 of the PCLCD provides, as it long has, that
    the agreement “shall apply to the maintenance and repair of
    all stevedore cargo handling equipment.” Citing the parties’
    expectation of automation-induced displacement of
    traditional longshore work, however, the parties in 2008
    added two new terms. The first (section 1.72) provides “that
    ILWU V. NLRB                         31
    the jurisdiction of the ILWU shall apply to the maintenance
    and repair of all present and forthcoming stevedore cargo
    handling equipment in accordance with Sections 1.7 and
    1.71 and shall constitute the functional equivalent of such
    traditional ILWU work.” And the second (section 1.73)
    relevantly states that
    [t]he scope of work shall include . . .
    maintenance and repair . . . of all present and
    forthcoming technological equipment related
    to the operation of stevedore cargo handling
    equipment (which term includes containers
    and chassis) and its electronics, that are
    controlled or interchanged by PMA
    companies, in all West Coast ports.
    Neither supports the Board’s proscribed limitations.
    First, neither term reinforces the Board’s conclusion that
    the “contract language demonstrate[s] that the collective-
    bargaining agreement changes were directed at new work to
    be based on the introduction of new technologies.” See
    IBEW, 357 NLRB at 2219. The Board’s analysis does not
    specify what language led to its “new work only”
    construction. Meanwhile, the terms’ application to “all
    present and forthcoming stevedore cargo handling
    equipment” and to “all present and forthcoming
    technological equipment related to the operation of
    stevedore cargo handling equipment” express a contrary
    intention. Such language unambiguously encompasses both
    new and preexisting M&R work, and therefore, the parties’
    negotiations, post-agreement conduct, and industry customs
    bear no relevance to its meaning. See Pierce Cnty. Hotel
    Emps. & Rest. Emps. Health Tr. v. Elks Lodge, 
    827 F.2d 1324
    , 1327 (9th Cir. 1987) (“Extrinsic evidence is
    32                    ILWU V. NLRB
    inadmissible to contradict a clear contract term.” (citation
    omitted)).
    Second, the Board was not free to ignore the plain
    meaning of the phrase “maintenance and repair of all
    stevedore cargo handling equipment” simply because such
    language is “very general.” See IBEW, 357 NLRB at 2219.
    A contractual term bearing a broad general meaning is no
    more inherently ambiguous than a similarly sweeping
    statutory provision. See Arizona v. Tohono O’odham
    Nation, 
    818 F.3d 549
    , 557 (9th Cir. 2016). In either case,
    mere generality tends to denote breadth, not ambiguity. See
    
    id.
     Neither the Board nor the intervenors point to a
    contractual provision suggesting an intent to limit the scope
    to mechanical M&R work. Nor do they explain how this
    more general language is inherently susceptible to
    conflicting meanings.
    Regardless, the parties’ inclusion of the phrase “and its
    electronics” in section 1.73 resolves whatever ambiguity the
    phrase “maintenance and repair of all stevedore cargo
    handling equipment” alone might have embodied—at least
    insofar as it concerns the inclusion of electrical M&R work.
    And it directly contradicts the Board’s conclusion that the
    PCLCD omits an “explicit mention of electrical work.” See
    IBEW, 357 NLRB at 2219. Neither the Board nor the
    intervenors suggest how work on the “electronics” of “all
    stevedore cargo handling equipment” might reasonably
    entail something other than electrical maintenance and repair
    work. As we see it, it is unlikely that it does. Thus, the
    Board again erred in looking outside the four corners of the
    2008 PCLCD to inject ambiguity into this otherwise clear
    contract term. See Pierce, 
    827 F.2d at 1327
    .
    Third, we conclude that the Board’s view that section
    1.72’s functional equivalence clause pertains only to the
    ILWU V. NLRB                          33
    work previously encompassed by section 1.71 is untenable.
    This construction not only misreads section 1.72 and ignores
    section 1.73, but also renders the functional equivalence
    clause itself superfluous.
    Read in relevant part, the functional equivalence clause
    of section 1.72 states “that the jurisdiction of the ILWU . . .
    shall constitute the functional equivalent of such traditional
    ILWU work.” The Board’s attempt to anchor this language
    to section 1.72’s intervening reference to section 1.71
    ignores section 1.72’s compound predicate structure. The
    correct reading of the functional equivalence clause does not
    define the scope of work. Section 1.73 does that. The clause
    instead enshrines the parties’ agreement that the scope of
    work included within the Longshoremen’s jurisdiction will
    be considered the functional equivalent of its traditional
    work.
    More fundamentally, the Board’s reading of
    the     functional      equivalence      clause
    impermissibly renders sections 1.72 and 1.73
    redundant. See Alday v. Raytheon Co.,
    
    693 F.3d 772
    , 784 (9th Cir. 2012) (“As in all
    contracts,     the    collective    bargaining
    agreement’s terms must be construed so as to
    render none nugatory and avoid illusory
    promises.” (quotation marks omitted)). All
    parties agree that section 1.71 did not change
    in 2008. However, if, as the Board suggests,
    section 1.72’s functional equivalence clause
    only reiterates the scope of work covered by
    previous versions of the PCLCD, then the
    parties’ addition of sections 1.72 and 1.73 in
    2008 accomplished nothing. The parties
    would have no need for a functional
    34                    ILWU V. NLRB
    equivalence clause if the 2008 PCLCD
    merely continued to encompass the same
    scope of work covered by previous versions.
    And likewise, the parties would have had no
    reason to add a term defining the scope of
    work if section 1.71 had already done so.
    All told, the Board misconstrued the 2008 PCLCD in its
    10(k) decision and, by extension, in its ULP order. The
    Board erred by consulting extrinsic evidence without first
    providing a legitimate basis for finding any of the relevant
    terms ambiguous. It then compounded that error by relying
    on such evidence to construe sections 1.72 and 1.73 in a
    manner that not only ignored their plain language, but also
    rendered much of their newly bargained-for provisions
    illusory. We hold that, subject only to exceptions not at issue
    here, the plain language of the 2008 PCLCD unambiguously
    assigns to the Longshoremen all M&R work, on all present
    and future stevedore cargo handling equipment—including
    its technological equipment and electronics—for all PMA
    members, at all West Coast ports.
    CONCLUSION
    For these reasons, we conclude that the Board erred by
    according the findings in its 10(k) determination preclusive
    weight, by ignoring Supreme Court precedent in favor of an
    impermissibly narrow construction of the work preservation
    doctrine, and in construing the 2008 PCLCD as excluding
    the disputed work. We accordingly GRANT both petitions
    for review, DENY the cross-petition for enforcement,
    VACATE the Board’s order, and REMAND for further
    proceedings consistent with this opinion.