No. 78-1950. May 14, 1979. David A. Rosenfeld, San Francisco, Cal., for petitioner. Walter C. Schumann, Washington, D.C., for respondent. Petition to Review a Decision of the National Labor Relations Board. Before CHOY and SNEED, Circuit Judges, and INGRAM, District Judge. The Honorable William A. Ingram, United States District Judge for the Northern District of California, sitting by designation. CHOY, Circuit Judge: Graphic Arts International Union, Local 280 (Union or Local 280) petitions for