No. 6961. April 12, 1968. Rehearing Denied May 17, 1968. Charles N. Steele, Washington, D.C., with whom Arnold Ordman, General Counsel, Dominick L. Manoli, Associate General Counsel, Marcel Mallet-Prevost, Asst. General Counsel, and Paul J. Spielberg, Washington, D.C., were on brief, for petitioner. Murray S. Freeman, Boston, Mass., with whom John J. Delaney, Jr., Boston, Mass., Henry G. Stewart, Cambridge, Mass., and Nutter, McClennen Fish, Boston, Mass., were on brief, for respondent. Before ALDRICH