Shaw's second novel, "The Troubled Air", chronicling the rise of McCarthyism, was published in 1951. He was among those who signed a petition asking the U.S. Supreme Court to review the John Howard Lawson and Dalton Trumbo convictions for contempt of Congress, resulting from hearings by the House Committee on Un-American Activities. Accused of being a communist by the Red Channels publication, Shaw was placed on the Hollywood blacklist by the movie studio bosses. In 1951 he left the United States and went to Europe, where he lived for 25 years, mostly in Paris and Switzerland. He later claimed that the blacklist "only glancingly bruised" his career. During the 1950s he wrote several more screenplays, including "Desire Under the Elms" (based on Eugene O'Neill's play) and "Fire Down Below" (about a tramp boat in the Caribbean).