Did you miss that I was referring to the non-Congressional aspect of the Red Scare i.e. the studios privately blacklisting communist sympathizers?

In case anyone missed my general point there, it was:

One can be worried about the chilling effects on speech, regardless of who is doing it; dismissing such concerns "because it didn't violate a law"[1] is confused, and a kind of category error.

[1] edit: or, in your case, relying on a court for all relevant judgments about this matter