He was a registered informant with the NYO of the FBI. So he obviously was tilting certain info they deemed helpful to their cause over the years.

As a born and bred NYC guy, who rubbed shoulders his entire life with street guys and wise guys, I'm sure he offered enough over the years about adversaries or guys he didn't like. That how it usually works. And generally speaking, 99% of the time, FBI reports don't spell out most details of what an informer offers. Thats just how they write it up for the fella's protection.