Tom Hagen says that Michael Corleone has opened himself up to Perjury and several other charges, if Frankie Pentangeli had testified and gone through with his sworn statements would Michael have faced a long prison sentence?
Or would he fight back and beat the charges? Michael seems to be terrified of prison and John Gotti got beaten up by a black inmate paid off by Aryan Brotherhood, Al Capone got humiliated in prison and backed down when threatened, Michael clearly would not last long either.