Blacklisted by the Hollywood studios, Lardner worked for the next couple of years on the novel "The Ecstasy of Owen Muir" (1954). Beginning in 1955, Lardner and fellow blacklistee Ian McLellan Hunter, working under pseudonyms, wrote episodes of television series, including "The Adventures of Robin Hood", "The Adventures of Sir Lancelot", and "The Buccaneers", for producer Hannah Weinstein, an expatriate American living in England. For several years, meetings there with the producer were attended exclusively by Hunter, who had managed to gain a passport despite his political activities, whereas travel abroad for Lardner was deemed "not in the best interest of the United States" by the Passport Bureau, a restriction lasting from 1951 to 1958, when the Supreme Court ruled that passports could not be denied for political reasons. The blacklist was lifted for Lardner when producer Martin Ransohoff and director Norman Jewison gave him screen credit for writing "The Cincinnati Kid" (1965). Lardner's later work included "M*A*S*H" (1970), for which he won the Academy Award for Best Adapted Screenplay, and "The Greatest" (1977), for which he re-wrote the original script by Bill Gunn. His final film project was an adaptation of Roger Kahn's book "The Boys of Summer".