I'm reading "Gaspipe: Confessions of a Mafia Boss" by Phillip Carlo. He also wrote "The Iceman" which is one of my favourites.

It gives a great inside look at the new york crime families as the author did exclusive interviews with Anthony Casso (they were neighbours when he was growing up). I find that sort of stuff facinating - but I am a little morbid so it's not for the faint-hearted!