When I was maybe 6 or 7 years old, I went to a church camp in French Creek State Park in Pennsylvania. Not too long after we had gotten there, the Pagans (MC) showed up. Maybe a hundred or more, and parked in an open area right across from the entrance to the camp. I remember at least one chariot-looking rig, but I don't know if it was a trike or what. Finally, a single police car showed up. Apparently the cop asked them to leave, and they did!