If you haven't seen this one, do it:
The story behind Godfather, the movie, it's a lot more interesting than you'd think and involves quite a bit of the real mafia as well.
www.youtube.com/watch?v=JGxsrq55fu8
If you're interested in the human psyche and serial killers, I can recommend the documentary about Richard "The Iceman" Kuklinski. It seems to take on his side of the story throughout, yet, it's intriguing and worthwhile to watch. Enjoy;
www.youtube.com/watch?v=QXgi72W2H7U
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I'm not a slave for entertainment, I'm entertainments personal slave,
So deep into writing I'm concerned bout the text on my grave.
www.youtube.com/watch?v=gV8ozGcGJ6o