If you're talking about street gangs like Crips and Bloods, then your talking about a loose affiliation of neighborhood gangs (Rolling 60's Crips, 83 Gangster Crips, etc) which are driven by mostly teenagers and twenty-somethings. There's not many "rules", "ruling body", or anything like that. Again, we're talking about neighborhood gangs of mostly teenagers and twenty-somethings. The older members might have a certain amount of pull of the younger ones, but that's as close to a leader they have.