No. 15966. August 28, 1959. Jerome D. Fenton, Gen. Counsel, Thomas J. McDermott, Associate Gen. Counsel, Marcel Mallet-Prevost, Asst. Gen. Counsel, Duane B. Beeson, William J. Avrutis, Attys., N.L.R.B., Washington, D.C., for petitioner. Louis Sherman, Cornelius Gray, William J. Brown, Washington, D.C., for Building Construction Trades Dept., AFL-CIO, intervenor. Elliott, Lee, Carney Thomas, Seattle, Wash., for Mountain Pacific Chapter of Associated Gen. Contractors of America. Lycette, Diamond Sylvester