Remove graffiti from your community. Graffiti is a sign of territorial dominance. Removing these signs reduces the chances of violence between rival gangs. It also sends out the message that the community will not stand for gang activity. Some communities allow residents to help cleanup graffiti. Ask local law enforcement about how you can participate in the cleanup process.
Graffiti removal typically involves using a wire brush to remove paint from various surfaces using a chemical graffiti remover. If you're removing graffiti from brick surfaces, especially red brick, professional help is recommended.