No. 80-7073. Argued and Submitted November 5, 1980. Decided March 6, 1981. Susan L. Dolin, Richard M. Fischl, Washington, D.C., for petitioner. Catherine Hagen, O'Melveny Myers, Los Angeles, Cal., for respondent. On Application for Enforcement of an Order of the National Labor Relations Board. Before WRIGHT and TANG, Circuit Judges, and HANSON, Senior District Judge. The Honorable William C. Hanson, Senior United States District Judge for the Northern and Southern District of Iowa, sitting by designation