No. 87-5107. Decided May 4, 1987. Mary Jane Gooch, Tate and Alden Law Firm, Lincoln, Neb., Steven C. Miller, Minneapolis, Minn., for Action Electric, Inc. David R. Hols, Felhaber, Larson, Fenlon Vogt, Minneapolis, Minn., for National Electrical Contractors Assn. Stephen D. Gordon, Gordon, Miller O'Brien, Minneapolis, Minn., for Local 292, International Brotherhood of Electrical Workers. Appeal from the United States District Court for the District of Minnesota. Before ROSS, Circuit Judge, HENLEY