Corleone family
Shortly after the Cuban fiasco, the U.S. Senate begins hearings on organized crime. To eliminate Michael as a competitor, Roth manipulates Corleone family "caporegime" Frank Pentangeli into testifying against Michael by having the Rosato Brothers, two small-time hoods, attempt to kill Pentangeli. He survives and, believing Michael ordered the attack, agrees to testify against the Corleone Family at a Senate hearing. The hearing is really a set piece arranged by Roth in hopes of removing Michael from the scene; the Senate committee's chief counsel is on Roth's payroll. As a counter-move, Michael has Pentangeli's brother, Vincenzo, flown in from Sicily to coerce Pentangeli into silence, thus destroying the government's case against Michael.