No. 17388. Argued November 6, 1963. Decided January 30, 1964. Mr. Herbert M. Ansell, Washington, D.C., of the bar of the Supreme Court of California, pro hac vice, by special leave of court, for petitioners. Mr. Herbert S. Thatcher, Washington, D.C., was on the brief for petitioners. Mr. David Barr, Washington, D.C., also entered an appearance for petitioners. Mr. Hans J. Lehmann, Atty., National Labor Relations Board, with whom Messrs. Stuart Rothman, Gen. Counsel, National Labor Relations Board