We stumbled upon this today in searching through Google.  The link below offers a gang heat map for Chicago.  Within the link, you can click on any of the gang names to find out where they are primarily located in the city of Chicago.

We have not determined if there are other cities included, but please check this out and let us know what you find!  We cannot attest to the accuracy of the information but definitely thought this would be a good tool to share with our members and visitors!