Dunne's political stance was decidedly liberal and reformist, but he was also determinedly anti-Communist. His involvement in the Committee for the First Amendment can arguably be read as just that—support for Constitutional free speech against a government entity (HUAC) that, to Dunne, seemed determined to usurp those rights. At various times dating to before the Second World War, he clashed with fellow members of the Screen Writers Guild who he felt were "pro-Stalin" Communists. Dunne's anti-Communist leanings would seem to be verified by his uninterrupted employment as a screenwriter on major Hollywood productions throughout the blacklist period, despite his quite vocal denunciation of HUAC.