Nos. 77-1239, 77-1367. Argued May 4, 1978. Decided September 26, 1978. Andrew Tranovich, Atty., N.L.R.B., Washington, D.C., a member of the bar of the Supreme Court of Pennsylvania, pro hac vice, by special leave of Court with whom John S. Irving, Gen. Counsel and Elliott Moore, Deputy Associate Gen. Counsel, Washington, D.C., were on the brief, for the National Labor Relations Board, petitioner in No. 77-1367 and respondent in No. 77-1239. Lewis M. Steel, New York City, with whom Eugene G. Eisner