Yeah, I think the Feds refer to it as "going native," and Pistone definitely had a bad case of it. Now this is just conjecture, but I'd be willing to bet that today the Feds use some kind of required therapy on their undercover agents while they're undercover to make sure their egos don't get out of control, and to keep them from going over to the dark side.

You cited some good examples of undercovers who went on to write books and were very impressed with themselves. I'd just add Rick Cowan to the list. I was a member, and later a business agent, in of one of the locals (IBT 813) mentioned in that book ("Takedown") for 25 years, and he was off base about some of the things that he wrote. But it did make for an entertaining read.