Books on mafia, serial killers, or hitmen

[captZEEbo]

Does anyone have some recommendations for books about the mafia, serial killers, or hitmen. I have never read any book about any of these subjects, except some book I got when I visisted Alcatraz that had like 2 pages written about like 40 Alcatraz inmates. I really like stuff like this in movies though, and I like reading crimelibrary.com

Failing books, if anyone knows some really interesting stories at crimelibrary.com or other sites, feel free to link them =) I don't really know remember anyone's story but Al Capone's (but I haven't even heard it in a long time), so don't assume I already know about a subject.