No. 86-2032. Heard May 8, 1987. August 14, 1987. Samuel C. Vazquez Matias with whom Hector L. Marquez, San Juan, P.R. was on brief for appellants. Fidel A. Sevillano Del Rio, Asst. U.S. Atty., with whom Daniel F. Lopez Romo, U.S. Atty., Hato Rey, P.R., was on brief for appellees. Appeal from the United States District Court for the District of Puerto Rico. Before BREYER and TORRUELLA, Circuit Judges, and CAFFREY, Senior District Judge. Of the District of Massachusetts, sitting by designation. TORRUELLA