Nos. 15494, 15544, 15555. Argued March 22, 1966. Decided April 18, 1966. Rehearing Denied May 5, 1966. Anthony Obadal, N.L.R.B., Washington, D.C. (Arnold Ordman, General Counsel, Dominick L. Manoli, Associate General Counsel, Marcel Mallet-Prevost, Asst. General Counsel, Allison W. Brown, Jr., Attorney, N.L.R.B., on the brief), for N.L.R.B. Bernard N. Katz, Philadelphia, Pa. (Meranze, Katz, Spear Bielitsky, Philadelphia, Pa., on the brief), for Building Construction Trades Council, etc. and James