No. 71-1864. Argued November 29, 1972. Decided July 13, 1973. Rehearing En Banc Denied August 6, 1973. Marcel Mallet-Prevost, Asst. Gen. Counsel, Daniel M. Katz, Atty., N.L.R.B., Washington, D.C., for petitioner. Robert H. Gorske, Milwaukee, Wis., for intervenor. Alan M. Levy, Milwaukee, Wis., for respondent. Before KILEY and CUMMINGS, Circuit Judges, and ESCHBACH, District Judge. District Judge Jesse E. Eschbach of the Northern District of Indiana is sitting by designation. CUMMINGS, Circuit Judge