I think you people are missing the big picture. Everyone's just fixated on their hatred for rats, but let me let you in on a little secret. Organized crime cannot even exist without some kind of cooperation with the authorities. It's inevitable. It's actually one of the things that keeps the gears of the machine oiled. Now who did he put away? Perhaps he only provided enough information to keep them happy so he could keep operating. Sounds like another Gregory Scarpa to me, and mob buffs worship that guy.