Nos. 106-108, Dockets 75-4018, 75-4045 and 75-4047. Argued November 10, 1975. Decided March 3, 1976. As Amended May 3, 1976. Janet C. McCaa, Atty., N.L.R.B., Washington, D.C. (Peter G. Nash, Gen. Counsel, John S. Irving, Deputy Gen. Counsel, Patrick Hardin, Associate Gen. Counsel, Elliott Moore, Deputy Associate Gen. Counsel, and Robert A. Giannasi, Asst. Gen. Counsel, Washington, D.C., on the brief), for petitioner-respondent N. L. R. B. Alan D. Gallay, New York City (Fellner Rovins and Ronald Kreismann