Most lists I have seen include Ward Bond of Wagon Train in the list of those who stood up for the U.S. Ronald Reagan, as the president of the screen actors guild decided to carry a pistol during this time period. But the popular meme was that it was the liberals who were the victims.
Reagan and others were threatened with acid in the face for opposing communism and some of the hard-core unions of the time. Acid works wonders in destroying the careers of actors.