'Cocaine: Leo and Ze' (2004) documentary about a favela in Rio that has to deal with a lot of drugs related crime. The movie is directed by the British filmmaker Agnus MacQueen. The favela where the movie whas shot is named Dona Martha and is one of the favela's that is walled recently by the by Rio's authorities.
http://www.imdb.com/title/tt0845974/
http://www.guardian.co.uk/world/2009/jan/06/brazil-rio-slum-barrier
http://observers.france24.com/en/content/20090608-rio-shantytowns-walled-eco-borders-favelas
