Is there a crime of mobbing to disrupt public order in the US too?

Yes, Big Momma Square Dancing was fined, but that was for being too loud. Many cities in the US have rules about noise. For example, car stereos can't be too loud and can't be heard at 50 feet. But those are local regulations. If you're in an appropriate place, it's still okay. For example, if you have a party in a park with a lot of people, it's fine if it doesn't affect anyone else. If you want to congregate on the street, you have to apply first so you don't interfere with traffic. The main thing is not to disturb others. Cause inconvenience to other mass bystanders.