BBM: I always heard them called "jackets". Usually, the inmates get a hold of those before the convicted inmate (he's not a new fish because of his prior incarcerations) gets to the prison. And you are absolutely right about the MM as far as CM throwing their name around to get "street cred". Anywhere the prison admin puts him, he still has to watch his back. Where there's a will, there's a way, and inmates have a lot of time to devise plans to get to targets.