No. 526, Docket 78-4145. Argued January 17, 1979. Decided March 5, 1979. Joseph P. Norelli, N.L.R.B., Washington, D.C. (John S. Irving, Gen. Counsel, John E. Higgins, Jr., Deputy Gen. Counsel, Robert E. Allen, Acting Associate Gen. Counsel, Elliott Moore, Deputy Associate Gen. Counsel, N.L.R.B., Washington, D.C., of counsel), for petitioner. Edward G. Imperatore, New York City (John D. Feerick, Skadden, Arps. Slate, Meagher Flom, New York City, of counsel), for intervenor. Moss K. Schenck, Brooklyn