No. 75-2505. September 27, 1977. As Amended January 12, 1978. Michael D. Stein, N.L.R.B., Washington, D.C., argued, for petitioner. George King, of Boornazian, King Schulze, Oakland, Cal., argued, for respondent. Michael B. Roger, Levy, VanBourg Hackler, San Francisco, Cal., argued, for intervenor International Assoc. of Theatrical Stage Employees. Before BROWNING and ANDERSON, Circuit Judges, and CRARY, District Judge. Honorable E. Avery Crary, Senior United States District Judge, Central District