"Many whose allegiance went to the Soviet Union may well be seen as traitors to their countries, and to the democratic culture. But their profounder fault was more basic still. Seeing themselves as independent brains, making their choices as thinking beings, they ignored their own criteria. They did not examine the multifarious evidence, already available in the 1930s, on the realities of the Communist regimes. That is to say, they were traitors to the human mind, to thought itself."