National Labor Relations Board v. International Brotherhood of Electrical Workers, Local Union No. 323 , 703 F.2d 501 ( 1983 )
City of Des Moines v. Public Employ. Rel. Bd. , 264 N.W.2d 324 ( 1978 )
Domestic Linen Supply & Laundry Co. v. Central States, Southeast & Southwest Areas Pension Fund , 722 F. Supp. 1472 ( 1989 )