Billy Battista was a different situation though, similar to Willie Boy. Battista was informing and would've continued to inform and taken his sentence had it not been for that chick Giacalone. She named him and basically ousted him as an FBI informant during one of the Gotti Trials, and Battista found out and disappeared, never to be seen again, by any Federal Agent. Willie Boy should've done the same, but he was on trial with Gotti, and being the man he was, he opted to sit in with his friends and try to plead his case. Gotti lured him into a false sense of security before having him killed.

The FBI hated Giacalone after she did that to Battista & Willie Boy, all to win her flimsy case that wasnt really very good anyway. It's one of the reasons she retired from law a little while after that trial was over.