Where I grew up there were gangs in my high school and to this day there's a consistent gang presence at the shopping mall where I used to hang out on a Thursday night as a teenager (and was often mistaken for a member by local security and cops). They don't do much though, just sort of hang out, and occasionally someone will stab someone but it's never a random attack, it's usually "that guy in the other gang tried to pick up my girlfriend" type of stuff. Gangs generally only care about other gangs.
The serious gangs here are biker gangs but once again, they don't really affect you if you're not involved.
The serious gangs here are biker gangs but once again, they don't really affect you if you're not involved.