I've read that a collection of crows is called a "murder." A lot of cows is called a "herd." Bunches of fish swimming together are called a "school."
I have a new nomination for a term. I think an assembly of assholes should be called a "plenty." I base this on the fact that, no matter where I go in this world, I find "plenty" of assholes. Any time someone asks me, "Are there any assholes around here?" I can reply confidently, "Plenty!"
I think I'll go to Wikipedia and write this up.