In Mafia Prince Leonetti says that there was a powerful Genovese captain, who isn't named in the book, who Casella met when he was doing time on the drug trafficking charges, who spoke on his behalf and this eventually saved his life..

One of the best parts of the book is when Scarfo and Casella are meeting with Chin, Fat Tony and Bobby Manna at the Triangle social club to discuss the death of Phil Testa. I'll type a little excerpt of it:

..According to Scarfo, who later told Leonetti what happened inside the meeting, Gigante wasted no time with pleasantries and started the meeting by speaking directly to Casella in his rapid-fire New York cadence.
''Listen, we know what happened. Don't lie to us. If you lie to us, we can't help you. Tell us the names of everyone who was involved in this plot.'' Scarfo told Leonetti that Casella answered the question directly.
''It was me. It was my idea. Me, Chickie Narducci, and Rocco Marinucci, and a kid Rocco knows.''
Scarfo said Fat Tony took the cigar out of his mouth and barked, ''This motherless fuck, the kid, does he have a name?'' and Casella responded,''I don't know his name,'' and then hung his head in shame.
Gigante smacked the table, and Casella looked up at him, and then the don spoke, ''You're finished. You are to retire immediately to Florida. You are forbidden from ever returning to Philadelpia. When you leave here, you get on a plane and you go. If you breathe a word of this to anyone, we will kill you, your brother, and your brother-in-law. Do you understand?''
Casella nodded his head and Gigante gestured for one of the Genovese soldiers to escort him out of the club. As Casella attempted to shake Gigante's hand, Gigante stared at him with disgust and spit on the floor in his direction, and Casella was whisked away.
With Casella gone, it was just Little Nicky and the three Genovese leaders. Again Gigante got right to the point.
''Well, Nick, I don't see no one else here, so I guess that makes you the new boss,'' at which point Gigante stood and Scarfo approached the table and kissed Gigante on each cheeck, as Manna and Salerno clapped their hands...