No. 15101. Argued November 13, 1959. Decided December 23, 1959. Mr. Richard H. Markowitz, Philadelphia, Pa., of the bar of the Supreme Court of Pennsylvania, pro hac vice, by special leave of Court, with whom Mr. Norman S. Altman, Washington, D.C., was on the brief, for petitioner. Mr. Melvin Pollack, Atty., N.L.R.B., with whom Messrs. Thomas J. McDermott, Associate Gen. Counsel, Marcel Mallet-Prevost, Asst. Gen. Counsel, and Alfred Avins, Atty., N.L.R.B., were on the brief, for respondent. Before