No. 75-1017. Argued June 3, 1975. Decided August 6, 1975. Margery E. Lieber, Atty., with whom Peter G. Nash, Gen. Counsel, John S. Irving, Deputy Gen. Counsel, Patrick Hardin, Associate Gen. Counsel, Elliott Moore, Deputy Associate Gen. Counsel, and John H. Ferguson, Atty., were on brief, for petitioner. George H. Foley, Boston, Mass., with whom Hale Dorr, Boston, Mass., was on brief, for respondent. Petition for review from the National Labor Relations Board. Before COFFIN, Chief Judge, McENTEE