Henry Hill was a very badass guy that took control of everything that he did for the Mafia. He was associated with the Lucchese crime family.
If someone asked him to do something, no questions asked, he did it. Someone needed something done, no questions asked, he did it. When he got in trouble, never ratted until the end when the real shit hit the fan.
He became an FBI informant and his testimony secured a lot of convictions. He spent a lot of time in the witness protection program.