Let me give you a list of books I'd recommend to really peak your interest in the topic of the mob. I'll try to add the author's name. In no special order, only as they come to mind...

Murder Machine by Gene Mustain and Jerry Capeci
Blood&Honor by George Anastasia
Mob Star by Jerry Capeci and Gene Mustain
Underboss by Peter Maas and Sammy Gravano
Mob Father by George Anastasia
The Westies by T.J. English
Family Secrets by Jeff Coen
The Enforcer by Bill Roemer
Accardo by Bill Roemer
Hitman by Howie Carr
Rifleman by Howie Carr
Vengeance Is Mine by ?? and Jimmy Fratianno
The Don by ?? (about Giancana)
Black Mass by Dick Lehr, Gerard O'Neil


..........to name a few. These books will teach you a lot about organized crime in the United States