The secret to organized crime is that if you don't snitch, you won't get rich. All gangsters with real money work with the cops.
They can work with cops by bribes, snitching is another matter.
The thing is, there is really no point in cooperating unless you're doing it at a substantial level, especially nowadays. The feds will not stick their neck out for you unless you give them actual, useable, actionable information. And with the majority Mafia busts, we can see that it only takes one or two rats to take down 10, 20, or 30 guys.
