Allen Dorfman may not have been a mobster himself, but he was vital to the Mafia's success and knew all its secrets.
Dorfman used his access to the pension fund of one of America's biggest Unions to set himself up as banker to the Mob.
The FBI realised that if they went after Dorfman they could potentially leave the Mafia bankrupt. And so, the biggest wiretapping operation in history rolled into motion.
However, once it became clear that Dorfman was heading to jail the Mafia realised that he might try to use his insider knowledge for a plea bargain. Could they take the risk? I think we know how this is going to end...