It's a little known fact that Pistone had one foot in the Colombo camp before the Bonannos took him in.
A little known fact?
His time with Jilly Greca and the Colombos took up about a hundred pages of his first book.
Understood, but the majority of the people out there (and I dare say in these Fora) got their info from the movie, and even though it was touched on, and 60% of the move was either a composites or completly false, I bet if you asked 100 people who saw the movie what family the guy was from in the Barber shop scene was from, 2 might be able to tell you.
A quote is a running joke in my house...anyime we are talking about someone, we throw in ..."He keeps to himslf, he's a jewel guy"
(It's a lot funnier than it sounds, trust me)
Anyway my point was it would be interesting to speculate the damage he could have done to the Colombos