From what I've read is in the early 60's he gave the FBI the names of men in many different families. I know a guy named Lenny who went to DC and got a ton of stuff on other families because there's too much wrong information out there about certain mafia organizations. When he was there he read some things the FBI wrote about Nick passing along certain information. He read the reports on at least 10 different families. Another thing he said was the member charts that are on the internet on the St. Louis family are totally false because many of the names never came up in any reports he read about them.