Amazing site, thanks!
Pie...
I am not completely happy with this website on Chicago Gangs
http://www.chicagogangs.org/
but it gives you a sense of it all....also links, though not as many as I would like.
There are all kinds of gangs in Chicago, most minority gangs and The Mafia.
Google for more info about Chicago gangs to gain a better understanding of this very sophisticated network of criminals here...and very, very LETHAL.