No. 87-1189. Argued February 12, 1988. Decided September 30, 1988. Robert G. Rothstein, of the Bar of the Supreme Court of Pennsylvania, pro hac vice, by special leave of court, with whom Michael N. Katz, Philadelphia, Pa., was on the brief, for petitioner. Bernard N. Katz, Philadelphia, Pa., also entered an appearance for petitioner. Linda Dreeben, Attorney, N.L.R.B., with whom Aileen A. Armstrong, Deputy Associate Gen. Counsel and Victoria A. Higman, Attorney, N.L.R.B., Washington, D.C., were on