According to documents obtained under the Freedom of Information Act, the FBI was worried that Ray Bradbury was spreading communist ideals through his writings. They were particularly concerned about The Martian Chronicles because of the “repeated theme that earthmen are despoilers and not developers.” Even more ludicrous, FBI informant Martin Berkeley called science fiction a “lucrative field for the introduction of Communist ideology.”
JPat Brown via MuckRock:
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Bradbury’s membership in the Screen Writer’s Guild, as well as his vocal opposition to McCarthyism, drew particular attention. FBI informant Martin Berkeley – notorious for his role as the House Un-American Activities Committee’s “number one friendly witness” – drew a portrait of Bradbury as pinko boogeyman:
After noting that science fiction “may be lucrative field for the introduction of Communist ideology,” Berkeley goes on to declare the entire field of science fiction writers as a veritable fifth column, intent on crippling America before her enemies.