Nos. 17388, 19990. Argued June 13, 1966. Decided July 14, 1966. Mr. Herbert M. Ansell, Los Angeles, Cal., of the bar of the Supreme Court of California, pro hac vice, by special leave of court, with whom Messrs. Herbert S. Thatcher and David S. Barr, Washington, D.C., were on the brief, for petitioners in No. 17,388 and respondents in No. 19,990. Mr. Hans J. Lehmann, Attorney, National Labor Relations Board, with whom Messrs. Arnold Ordman, General Counsel, Dominick L. Manoli, Associate General Counsel