Illinois State Police: Street Gang Graffiti and Symbols
- PDF document contains common graffiti symbols of Chicago's largest gangs.
- http://www.isp.state.il.us/media/docdetails.cfm?DocID=543

Nograf Network Inc
- Contributes to the prevention of graffiti vandalism through information exchanges between those involved in law enforcement, prosecution, community-based organizations, abatement practitioners, educators, and vendors.
- http://www.nograffiti.com/

Graffiti Hurts
- A grassroots community education program dedicated to raising awareness about the harmful effects of graffiti vandalism on communities. Helps communities initiate prevention activities, and educate youth and adults about the impact of graffiti.
- http://www.graffitihurts.org/

Graffiti Related Links on the World Wide Web
- Links to city, law, and police ages; education, educational materials and books; gangs; graffiti magazines; graffiti advocates; and neighborhood organizations and abatement projects.
- http://www.dougweb.com/grlinks.html

Art Crimes: The Writing on the Wall
- Is graffiti art or a crime? This site profiles the debate between taggers and police officers.
- http://www.graffiti.org/