According to Kenneth Lloyd Billingsley in an article published in 2000, the Communists considered Koestler's novel important enough to prevent its being adapted for movies; the writer Dalton Trumbo "bragged" about his success in that to the newspaper The Worker.
He was also the literary agent for several writers, including Dalton Trumbo and Ring Lardner Jr., both of whom were blacklisted in the McCarthy era.
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Some of their films include Dillinger (1945), Suspense (1946), Gun Crazy (1949), Carnival Story (1954), The Brave One (1954, which earned writer Dalton Trumbo (who also worked on Gun Crazy) a Best Screenplay Academy Award), Gorgo (1961), Captain Sindbad (1963), and Heaven With a Gun (1968).