My copy of The Sixth Family just got to me today from Amazon. I've heard nothing but good things about the book. And I'm already on chapter 3, good read so far.

The Boys Of Chicago Heights: The Forgotten Crew Of The Chicago Outfit is a good book as well, my only gripe would be how short it is. It has a lot of insight about how influential the Chicago Heights crew was during the Capone era. And how they later would bring The Outfit loads of money through they're gambling, illegal poker machines, and the Calumet City strip, where pretty much every club on the strip was under the control of the Chicago Heights crew. They failed to recruit and make new men and after Al Tocco, the crew went pretty much extinct. According to the author, of course.