No. 78-1030. Argued June 5, 1978. Decided September 27, 1978. Jesse I. Etelson, Atty., N.L.R.B, Washington, D.C., with whom John S. Irving, Gen. Counsel, John E. Higgins, Jr., Deputy Gen. Counsel, Carl L. Taylor, Associate Gen. Counsel, Elliott Moore, Deputy Associate Gen. Counsel, and John H. Ferguson, Atty., Washington, D.C., were on brief, for petitioner. Harold N. Mack, Boston, Mass., with whom Philip J. Moss, and Morgan, Brown, Kearns Joy, Boston, Mass., were on brief, for respondent. Petition