No. 17709. Argued November 20, 1963. Decided December 12, 1963. Petition for Rehearing En Banc Denied February 12, 1964. Mr. Tim L. Bornstein, Washington, D.C., with whom Mr. S.G. Lippman, Washington, D.C., was on the brief, for petitioners. Mr. Melvin J. Welles, Atty., N.L.R.B., with whom Messrs. Dominick L. Manoli, Associate Gen. Counsel, and Marcel Mallet-Prevost, Asst. Gen. Counsel, N.L.R.B., were on the brief, for respondent. Mr. Jacob Sheinkman, New York City, for intervenors. Mr. Elliot Bredhoff