One of my favorite films that a lot of people haven't seen is called "City of God". its a brazilian flick about the slums of Rio and the violent gangs there, a boy who wants to be a photographer how is from the slums, two childhood friends who become gang leaders, one who lives for the life and the other who wants to get out of the life and become a hippie with his girlfriend, and an gang war that starts accidentally. Incidentally, its all based on a true story (one of my favorite parts is at the ending credits where they show news reels of some of the real people involved) Its in portuguese, its super violent at times, but startlingly well done. its directed by the same guy who did the constant gardner, though this is a superior movie in my opinion.