I would have used the phrase, young people with a reputaiton for resolving issues with violence, over underclasses.If I may ...
Yeah this. It's like attending a PG County / Southeast DC social gathering that includes a majority of everyone from the underclasses.
The same problem plagued 6 Flags in New Jersey. Situated where it was, they would end up having rival groups show up on the same day. Usually resulting in a disagreement - sometimes an all out brawl. The shame of it is, it makes it unsafe for families of all classes with small children.
How do they restrict / control unsupervised young adults without crossing a legal line?