Books on mafia, serial killers, or hitmen

[Slow Play Ray]

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Black Mass is a good read about James "Whitey" Bulger.

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I am reading this right now - it's decent so far.

Also, Lorenzo Carcaterra's (the guy that wrote 'Sleepers') newest novel 'Gangster' is a decent quick read - it's a fictionalized life story of a mobster with a pretty generic, yet entertaining anyway, plot. I am a fan of his writing style.