Books on mafia, serial killers, or hitmen

[SNOWBALL]

I read Murder machine maybe nine years ago, and I liked it a lot at the time. Its about the gemini gang which was led by Gambino family Capo Roy Demeo. They used to chop up the people they killed and hide the body parts in different parts of the city. There are a lot of interesting characters in the book. Supposedly, the character named Dominic is the inspiration for Michael Corleone's character in the godfather. Also, Geena Davis makes a cameo as a coke user smitten with the mob crowd.