Name some guys off the top of your head who enjoyed killing that would have made excellent associates or members of organized crime.

One guy that comes to mind is the Night Stalker Richard Ramirez. Definitely would fit in quite well with the Cartels in Mexico.

Ted Bundy would have made an excellent member of the mob. I easily could have seen him as a guy who would have taken great pride working for the mafia and being an excellent hitman, which he would have taken great pleasure in carrying out some brutal murders that most guys wouldn't have been able to do. Ted had a very very high IQ and not only would have made a great KILLER as we all know he was good at, but also a good earner in white Collar crime or whatever they wanted him to do.