Nos. 926, 646, Dockets 74-1035, 74-2211. Argued June 16, 1975. Decided October 17, 1975. Mozart G. Ratner, Washington, D.C. (Plato E. Papps, Washington, D.C., of counsel), for petitioner. Marion Griffin, Atty., N.L.R.B., Washington, D.C. (Peter G. Nash, Gen. Counsel, John S. Irving, Deputy Gen. Counsel, Patrick Hardin, Assoc. Gen. Counsel, Elliott Moore, Deputy Assoc. Gen. Counsel, John D. Burgoyne, Atty., N.L.R.B., Washington, D.C., of counsel), for respondent. John A. McGuinn, Washington, D.C.