fbi files we combed through reveal informant jack van hangingham shared a cell with him. >> he told us about jack ruby. marcello had met him in dallas, texas. marcello was talking about his favorite subject, the kennedys and being deported. he flew into a rage. i had that little son of a pitch killed and i'd do it again. he was a thorn in my side. i wish i could have done it myself. >> the fbi asked marcello if he made the revealing statement a few years later. >> and marcello of course denied it. that indicates to me there was an informant report to that effect. >> the fbi had the classified recordings, then laningham says the tapes had marcello naming him as his hired gun. the tapes if released could help answer questions of conspiracy. >> you got to explain ruby and oswald. both of them have years of associations with mafia figures.