"The Brotherhood" was my favorite book too. It had a lot of info about Casso and Kaplan that I wasn't aware of, I had a hard time putting this book down. I also liked "Gaspipe" a lot despite the errors. Murder Machine and Underboss were great books too, I just hated how they tried to make the rats ( Montiglio and Gravano) out to be sympathetic and heroic characters. The first mafia book I read was "Boss of Bosses" years ago, and from what I remember it was a good read.

The worst I've read are "Double Cross" and "Made Men."