Oh ya? Start fluckin naming them, Polly Anna.
The one I'm thinking of is the same one classically used to break the back of organized crime.
Lock up every known leader and enforcer. It's the only way the witnesses can testify without being scared witless.
I'm challenging you because I'm hoping you can come up with other, perhaps even better solutions.
I don't think any single magic bullet will slay this beast.