Where are the best locations to find active gangs?

I am doing a paper on criminal gangs in Phoenix, AZ and would like to interview some of them to find out why they do what they do. Any great places to find or locate in my area?

Chas2011-06-26T00:43:25Z

Large, urban cities with cultural diversity and economic stratification.

Anonymous2011-06-26T00:41:34Z

in my pants