Sammy Gravano reveals the moment he decided to cooperate with the government against John Gotti

Sammy "The Bull" Gravano lived by the Mafia's code of loyalty for years, but secretly recorded footage of John Gotti — and what Gravano says came next ultimately convinced him the oath was dead and it was time to switch sides.

"I said, 'Okay.' And I walked away," Gravano recalled on the "Hang Out With Sean Hannity" podcast.

"Well, as I walked away, I said, 'F--- the Mafia, f--- the oath and f--- John Gotti — I'm switching sides. He wants to play chess with me. Let's play chess.'"

JOHN GOTTI PAL...