If a person who is not a parent and not a (government school) teacher touches a child, it becomes grounds for legal action by Child Protective Services. So, either get the parents, the cops, or Child Protective Services to come in. They claim to be the only entities qualified to handle unruly children, and they will use the courts to punish those who undertake self help.
I know and that’s complete crap. Freaking lawyers. These little jerk kids know you can’t do anything to them as well. I am glad I am old because when these little jrks are adults it’s going to be “Lord of the Flies”, out there. I hope everyone is happy.