local-union-no-98-of-the-sheet-metal-workers-international-association , 433 F.2d 1189 ( 1970 )
national-maritime-union-of-america-afl-cio-v-commerce-tankers-corporation , 457 F.2d 1127 ( 1972 )
Sheet Metal Workers International Association, Local Union No. 223 v. National Labor Relations Board , 498 F.2d 687 ( 1974 )