. Serene, Sp. Attys., William F. Weld, U.S. Atty., and Jeremiah T. O'Sullivan, Sp. Atty., Boston, Mass., were on brief for plaintiff, appellant. Joseph J. Balliro, Boston, Mass., with whom James L. Sultan, Boston, Mass., was on brief for defendant, appellee. Before BREYER and TORRUELLA, Cir- cuit Judges, and