A little more on Sao Paulo
Here is a news report from a couple days ago. It speaks of the interesting matrix between footballers and the men who have been behind a rash of kidnappings recently. Young men growing up in the favelas dream of becoming footballers but for most a life of crime is the more likely path. In the end we have kidnappers from the favelas robbing those who have managed to escape from them (in this case). The article also mentions the prison situation and the process of learning from other inmates:
"The first prison wing exclusively for kidnappers is also being constructed, in the hope that isolating them will stop other inmates learning the latest trends."
You can see the report here.