18 street Gang members 18th Street Gang. Unlike others, they accepted anyone — Mexicans, Salvadorans, Guatemalans. That’s why their numbers exploded. Today, they have more than 30,000 members, spreading from the U.S. to Central America. Their tattoos show '18' or 'XVIII', and they’re known for violence, drugs, and extortion. But their biggest enemy? The deadly MS-13. 18th Street — one of the most feared gangs in the world." What will you say to them? | Inside Prison