Nos. 74-1608, 74-1668. Argued September 9, 1975. Decided December 8, 1975. Rehearing and Rehearing En Banc Denied January 13, 1976. Ann Neydon, New York City, for petitioner in No. 74-1608 and intervenor in No. 74-1668. Arthur M. Goldberg and George Kaufman, Washington, D.C., were on the brief for petitioner in No. 74-1608 and intervenor in No. 74-1668. John F. Depenbrock, Atty., N.L.R.B., with whom John S. Irving, Deputy Gen. Counsel, Patrick Hardin, Associate Gen. Counsel, and Elliott Moore, Deputy