re: Communism in the US
You should read Diana West's books
One is about how they invilgrated the govt before WW2 (and was how the Frankfurt School members were so easily inserted everywhere)
and the other is called "Red Thread" and investigates the ties to Communism of everyone involved (major players & names) in the Spygate/RussiaGate hoax.
She has a number of interviews on both you can watch or listen to online on jewtube or her own website
dianawest.com