No. 11888. Argued January 10, 1957. Decided March 27, 1957. Melvin Pollack, Washington, D.C. (Theophil C. Kammholz, General Counsel, Marcel Mallet-Prevost, Asst. General Counsel, Arnold Ordman, Attorneys, National Labor Relations Board, Washington, D.C., on the brief), for appellant. Richard H. Markowitz, Philadelphia, Pa. (Louis H. Wilderman, Paula R. Markowitz, Philadelphia, Pa., on the brief), for respondents. Before GOODRICH, KALODNER and HASTIE, Circuit Judges. HASTIE, Circuit Judge. A controversy