No. 15862. Argued March 2, 1961. Decided July 6, 1961. Petition for Rehearing Denied August 23, 1961. Mr. Tim L. Bornstein, Washington, D.C., with whom Mr. S.G. Lippman, Washington, D.C., was on the brief, for petitioner. Mr. Melvin J. Welles, Washington, D.C., of the bar of the Court of Appeals of New York, pro hac vice, by special leave of court, with whom Mr. Stuart Rothman, Gen. Counsel, N.L.R.B., Mr. Dominick L. Manoli, Associate Gen. Counsel, N.L.R.B., and Mr. Marcel Mallet-Prevost, Asst. Gen