Betsy Blair had played Clara in Chayefsky's original teleplay, but by 1955 she was tainted by the blacklist: her Marxist and alleged Communist sympathies had effectively sidelined her in an industry still deep in the paranoias of McCarthyism. When the film version of Marty moved forward, Blair lobbied hard to reprise the role despite studio resistance. Her husband, Gene Kelly — then a major MGM star and producer — brought real studio clout to bear. According to contemporary accounts, Kelly leaned on United Artists and reportedly threatened to withdraw from the high‑profile musical It's Always Fair Weather (1955) unless Blair was cast. Kelly's intervention worked; United Artists relented and Blair was given the role of Clara. The incident is emblematic of the blacklist era's coercive climate and the way established stars could, at times, use their box‑office power to blunt its effects. Blair's casting also changed Marty itself: the film expanded Clara's role, and the presence of a blacklisted actress in a Best Picture winner highlighted both the injustices of the blacklist and the messy, ad‑hoc ways it was occasionally resisted by sympathetic colleagues.
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