THE BROTHERHOODS is one on my list. I have read THE GOOD RAT though, i like Breslin's style!
The Brotherhoods is actually my all time favorite mafia book. It's got everything.
Other books I recommend
Takedown by Rick Cowan
Blood & Honor by George Anastasia
Mr. Capone by Robert J. Schoenberg
Gotti by Jerry Capeci
The Valachi Papers by Peter Maas
Born To Steal by Gary Weiss