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: I STASHED $10M IN MY KID'S TOYCHEST At the center of that decision were secretly recorded conversations in which Gotti discussed the Castellano hit and other mob activity, recordings Gravano said initially left him frustrated with the boss.

Gravano said Gotti's loose talk initially angered him, but the final straw came later.

"At first, I was annoyed in a way, like, man, you don't know when to shut your f---ing mouth," he said.

"But it went beyond that." Gravano said the situation escalated after their arrests, when Gotti sought to control the lawyers and Gravano learned how the defense planned to address the tapes before a jury.

EX-MOB CAPO ALLEGES FURIOUS RFK WEAPONIZED THE FBI AGAINST HIS FATHER OVER MARILYN MONROE "They're going to turn around, including your lawyer, and say to the jurors, 'You heard the tapes.

Sammy's a monster.

Killed all these people, took over the businesses and everything.

Poor John Gotti.

You hear him complaining on the tape.

It's not him.