Almost immediately after World War II, our most important ally, the Soviet Union, became our most serious adversary-cum-enemy. For Americans in 1950, it was not delusional to worry about international Communist aggression or Soviet espionage in the United States. But that’s the problem with a conspiracist mindset. After some kernel of reality triggers exaggerated fears and a possible explanation, it grows into an imaginary labyrinth of all-powerful evil, an elaborate based-on-a-true-story fiction that passes for nonfiction, such as the fantasy that thousands of committed Communists were
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