It should be noted that when anti-Communist fervor is aroused, the demand for serious evidence in support of claims of “communist” abuses is suspended, and charlatans can thrive as evidential sources. Defectors, informers, and assorted other opportunists move to center stage as “experts,” and they remain there even after exposure as highly unreliable, if not downright liars

— Manufacturing Consent by Edward S. Herman, Noam Chomsky, Edward S. Herman, and 1 other