As part of David Bernstein and Noah Isackson's excellent piece on politicians and gangs in Chicago, we included a map of Chicago gang territory based on CPD information. Out of curiosity, I plotted 2011's homicides (through 12/11) and overlaid them on the gang-territory map. It's approximate, but it's a useful rough sketch of the overlap.
![Chicago gang territory map](/wp-content/archive/whet/gang-map(1).jpg)
Update: @SethLavin makes the point that the above map correlates with CPS probation schools. It's true:
![Chicago Public Schools probation schools](/wp-content/archive/whet/CPS-probation-schools.jpg)