Nos. 81-1012, 81-1179 and 81-1412. Argued July 15, 1981. Decided September 21, 1981. Corinna Lothar Metcalf, Eric Moskowitz, 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, Aileen A. Armstrong, Asst. Gen. Counsel for Special Litigation, W. Christian Schumann, Washington, D.C., on brief), for N.L.R.B. Deborah Crandall, Washington, D.C. (Andrew M. Kramer, Susan