We had come to Alta Lake SP in WA to camp for a few days with our sons and their kids on Memorial Day. Just after we set up, seven cars arrived across the road from us and set up in 3 sites at the CG with more that 20 young "adults" and 6 children. The first thing that they did was to put shot glasses and 1/2 gallon Vodka bottles on the tables, and try to set up their tents (entertaining). The Russian speaking campers got very loud with singing (entertaining) and then drunken yelling (not so entertaining). They were trying to start a fire with no success, so I went over with some paper and kindling and to befriend a few before the trouble I could feel was coming, had started.
Another couple set up their TT next to the Russians, who had expanded a bit into their campsite. He was black, and she was white, with 3 children, and the insults and threats began, with the family unable to use their fire pit, and retreated into their TT. I asked them to join our campfire, but they said that they were OK.
The CG hosts came to ask the Russians to please quiet down, but they refused, and later threw rocks at their RV. They called the Park Rangers, who came and warned them, which helped a bit, but it was still a very volatile situation.
Those of us in surrounding campsites talked with each other, and prepared for further issues. The CG hosts retreated to their TT, feeling threatened, which was probably a good idea. In the morning, the Park Rangers came by and suggested an undeveloped campground for the Russians to move to, who were very upset about that suggestion. The Rangers left, and a son of a neighboring camper ran through their site, and the still drunken campers, threw rocks at him. The Rangers were called again, and returned to stand over them until they moved on.
After they moved on without further problems, but with lots of bad stares and a few insults, more cars quickly arrived, and other groups of Russians set up camp. We all groaned, but they came to us and apologized for their "friends". There were no further issues.