What's worse is that there are STILL Communists (Marxists actually) in Hollywood and they're doing far more damage than their predecessors of the 30s-50s. Along with their tenured colleagues at the universities they're presiding over the death of American culture. Yes, the anti-Communists of yesteryear were right, but where is the anti-Marxist movement today? It's certainly keeping itself well hidden.
Good question. I think part of the genius of the revolutionary left today is its ability to hide in plain sight. They are everywhere, even in high-placed federal jobs. But they avoid presenting a target by never threatening to overthrow the US government.
I will mention a couple of their foes. The New Criterion is a genuine intellectual publication that exposes Communist remnants, critical theory, transgressive art, etc. Mark Steyn is often published there. David Horowitz is having some success engaging American academia's discrimination against conservative thought.