The practice of rewriting history to give it the approved left-wing spin has been applied energetically to the early Cold War period. Not just to Senator McCarthy’s investigations but also to the investigations of Hollywood by the House Un-American Activities Committee.
In fact many liberals know so little of the real history of those times that they think McCarthy was responsible for the HUAC hearings in spite of the fact that as a senator he obviously had no connection with a House committee, and in spite of the fact that HUAC’s probing of left-wing influence in Hollywood began when McCarthy was still a newly-elected and completely unknown senator.
Just as McCarthy turned out to be right about Soviet spies in the State Department and the Defence Department, so too HUAC was entirely correct in its view that Hollywood was overrun by communists and communist fellow travellers. Most of the “innocent” victims of the Hollywood blacklist that liberals have elevated into martyrs for freedom really did hold extreme left-wing views and they really were consciously and deliberately using Hollywood to propagate those views. If they weren’t actually traitors they were very close to it. They were certainly actively working to subvert their own country (or in the case of the various émigrés their adopted country).
Of course the situation today is much worse and the state of modern Hollywood provides ample evidence that the threat perceived by HUAC was very real indeed.
Like the term “McCarthyism” the blacklist has been used by the Left as a stick with which to beat anyone who dares to disagree with them. And their rewriting of history has been so successful that today their version of events, a version that maintains that communist infiltration of Hollywood was merely a paranoid conspiracy theory, is accepted unquestioningly.