No. 81-2067. Argued February 2, 1982. Reargued Before the Court In Banc November 8, 1982. Decided December 29, 1982. William Wachter, Susan Tepper Papadopoulos (argued), Attys., N.L.R.B., Washington, D.C., 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, Washington, D.C., for petitioner. Shawe Rosenthal, Earle K. Shawe, Warren M. Davison (argued), Leslie R. Stellman, Baltimore