Pisciotta, Paciello, Cicale, to name just a few of the most recent. Not to mention the fact that they knew where Gravano was and never hit him (even though it was talked about, but talk is cheap). Same goes for D'Arco. They've known his whereabouts in Florida forever.

It's like Dom said. There's no upside in hitting a guy after he flips. The Feds are letting them earn and keep the status quo right now. If they ever hit a high profile rat the government would turn it on like a water faucet. The smarter bosses know this.