I suppose it depends on what you're after, Big Shot Rob (e.g., a biography on one gangster, on a whole gang, or on a certain Mafia event like the St. Valentine's Day Massacre). I've been a gangster movie fan for a long time, but just recently got into books on gangsters. I wanted biographies of mob figures within a certain Family, so I bought Sammy Gravano's Underboss as well as Gotti: Rise and Fall. I'm not necessarily recommending these (although Gotti: Rise and Fall is pretty decent), but just showing you how I went about what I was looking for. I also wanted what you might call a "Mafia-for-dummies" book, so I bought The Mafia Encyclopedia by Carl Sifakis. It's an excellent quick reference book on Mafia figures, terminology, etc. and costs about $20. Anyway, happy reading, man! (And in case I haven't formally greeted you before, welcome aboard, dude!)