90% of street gangs are indeed packs of irritating, low-level petty crime 15 tot 20-year olds. But there's 10% that could apply for organized crime status. Gangs like MS13, Crips, Bloods,...the vast majority of its members are annoying shits who think murdering a would-be member for refusing to steal a lollipop makes them hardcore. But there still are some (few) factions in these gangs who are very organized.
Native Mob seems to be more or less organized.