“they will show up in large groups at pools and run amuck”
But not IN the pool.....at least not the deep end.
No they would literally jump into the pool also. You are right, mostly the shallow end but when 30 of them show up at the same time, it was a mess. They ran amuck and were loud and dangerous. You had to be careful they didn’t land on you when they jumped in the pool.
Growing up, Memphis used to have several city run swimming pools that ended up with nothing but blacks. They would announce their opening each year on the news. They eventually shut down even though Memphis is run by blacks now.