No. 15205. Argued February 16, 1960. Decided April 18, 1960. Mr. Benjamin C. Sigal, Washington, D.C., with whom Mr. David S. Davidson, Washington, D.C., was on the brief, for petitioner. Mr. Melvin J. Welles, Atty., N.L.R.B., of the bar of the Court of Appeals of New York, pro hac vice, by special leave of court, with whom Messrs. Thomas J. McDermott, Associate Gen. Counsel, N.L.R.B., and Marcel Mallet-Prevost, Asst. Gen. Counsel, N.L.R.B., were on the brief, for respondent. Mr. Gerard D. Reilly