No. 80-1782. Submitted June 15, 1981. Decided October 7, 1981. Frederick Havard, Atty., argued, William A. Lubbers, Gen. Counsel, John E. Higgins, Jr., Deputy Gen. Counsel, Robert E. Allen, Acting Associate Gen. Counsel, Elliott Moore, Deputy Associate Gen. Counsel, N.L.R.B., for petitioners. Charles A. Werner, argued, Tara, Levy, Schuchat, Cook Werner, St. Louis, Mo., for intervenor-petitioner Local No. 1, Intern. Broth. of Elec. Workers, AFL-CIO. Carlton, Fields, Ward, Emmanuel, Smith Cutler, P