That’s freedom in both directions.
At its worst Hollywood created a black list for alleged communist sympathizers. That was a very specific kind of rating system for the same benefits. Most Americans were justly terrified of the Soviet Union and its genocidal leadership at the time, and distributing a film written by or starring someone who publicly endorsed communism would have killed box office and likely had the studio boycotted by large anti-communist groups.
That said, the black list unfairly included lots of people who were at most interested in social justice.
Today the same thing has happened to Mel Gibson and us happening to Johnny Depp. Don’t expect your employers to invest their millions into help you promote repugnant behavior or beliefs to their customers.
And this is yet another escalation on the road that started with “we’re just going to censor tweets that literally say the sky is green.” Google has banned an entire social network.
It’s exactly what social conservatives did back when they controlled the levers of government and industry in the mid-20th century. They prevented liberals from spreading their ideas, because that could cause social unrest, violence, etc. (And there was violence, such as anarchist leftist bombings.)