I doubt very seriously that we would have handed China over to the Communists if not for Communist agents and fellow travelers in our government and media at that time.
Is this a "crime" by any particular Communist agent of influence? I don't know. But it is certainly something that anyone with a conscience ought to feel extremely guilty about. It resulted in the Korean War, the Vietnamese War, the Vietnam War protests that handed Southeast Asia to the Communists, and infinite suffering in China itself.
It can also be argued that it is a crime. Ezra Pound was punished for doing propaganda for Mussolini in the Second World War. These folks were doing propaganda for Stalin in the midst of the Cold War, when it was clear to most people that the Soviet Union was our enemy and an enemy to the peace and stability of the whole world. We are talking here about card carrying members of a party that had been declared illegal.
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Really? What about Howard Da Silva? Ten years without work because of something someone said about him.