Gosh James I’m sorry, I didn’t think about being more specific. They have a very extensive website that offers tons but evidently most of it is intended for “members only”, i.e., law enforcement/law enforcement-related fields. I’m a retired school resource officer but haven’t actually joined myself. I have a booklet that I downloaded, in .XPS form: http://www.communitycorrections.org/images/publications/QuickGuidetoGangs.pdf.
Anyway, the main site lists a whole slew of state and regional .orgs, and includes the International Latino Gang Investigators, as well as Inland groups. Another idea you’ve given me is to talk directly to our local PD and sheriff’s department, as we’ve some fairly wicked redneck gangs around here. I hope the booklet helps a little, and I’ll try to remember to come back periodically and update as I learn new things.