This is high school level red scare history.
They're not associated with ANY COMMUNIST PARTY. It's a little cult run by a weirdo. Don't call them communists.
They're just fascists. They're not marxists.
Read a book
I think it's pretty straightforward. Go ahead and play dumb, pretend you can't read, you'll find out what "left unity" means soon first hand. You'll realize these people are intractable manchildren.