United States of America, Appellee, v. Esnoel Lopez-pena, Defendant, Appellant.united States of America, Appellee, v. Hector Burgos, A/k/a "tito," Defendant, Appellant.united States of America, Appellee, v. Elvin Perez Soto and Fernando Rupert-gonzalez, Defendants,appellants.united States of America, Appellee, v. Santos Jesus Martinez-torres, Defendant, Appellant.united States of America, Appellee, v. Luis Alfredo Martinez-torres, Defendant, Appellant.united States of America, Appellee, v. Epifanio Martinez-torres, A/k/a "fanny," Defendant, Appellant, 890 F.2d 490 (1st Cir. 1989)