No. 95-1606 Argued October 24, 1996 Decided June 27, 1997 Stephen M. Shapiro argued the cause for the petitioner. Timothy S. Bishop and Andrew E. Zelman were on brief. Evan M. Tager entered an appearance. David A. Fleischer, Attorney, National Labor Relations Board, argued the cause for the respondent. Linda R. Sher, Associate General Counsel, and Aileen A. Armstrong, Deputy Associate General Counsel, were on brief. Robert D. Kurnick argued the cause for the intervenors and for amicus curiae AFL-CIO