Nos. 703-705, Docket 72-1926, 72-2224, 72-2315. Argued February 14, 1973. Decided July 9, 1973. Harold Dublirer, New York City (Dublirer, Haydon Straci, New York City, of counsel), for Amalgamated Local Union 355. Leonard Leibowitz, New York City (Richard Dorn, and Sipser, Weinstock, Harper Dorn, New York City, of counsel), for Local 259, United Automobile Aerospace and Agricultural Implement Workers of America. Douglas S. McDowell, Washington, D.C. (Peter G. Nash, Gen. Counsel, Patrick Hardin, Associate