and one them, basically, was the guy who stayed at scarpa's right hand, so he saw scarpa go off and get phone calls, and then come back and say, "here's an address where i think we can find somebody to kill. i just got it from my source." >> cooper: after hearing what scarpa's associates had to say, four f.b.i. agents accused their boss, lin devecchio, of leaking information to his informant, greg scarpa. one of the agents specifically remembered devecchio asking for addresses that ended up in scarpa's hands, and these were no ordinary addresses. they were the suspected hideouts of mobsters greg scarpa was trying to kill. did you ever give scarpa any law enforcement information? >> devecchio: never, never. >> cooper: his son disappeared right on the eve of him about to be arrested by the d.e.a. did you tip him off for that? >> devecchio: no, i did not. i went to him and asked him, i said, "you know where he is?" he said, "i don't know where he is, lin." was he lying to me? maybe. but he looked me in the eye and said, "i don't know where he is, lin." >> cooper: the f.b.i. launched an int