In 1945, Brewer became the international representative for the
International Alliance of Theatrical Stage Employees (IATSE) union in Hollywood. He worked closely with
Ronald Reagan, then a leader in the
Screen Actors Guild, to oppose
communist influence in unions representing the motion picture industry. On October 28, 1947, Brewer testified before the
House Un-American Activities Committee, naming 13 actors, directors, and writers that he believed were communists. In March 1949, the pair formed the
Motion Picture Industry Council to fight communism in Hollywood and to clear the names of individuals who had been falsely accused of communist associations. The council also vetted those who had renounced their former associations with communism. In June 1953, Brewer succeeded
John Wayne as president of the
Motion Picture Alliance for the Preservation of American Ideals, another anti-communist group in Hollywood. On August 24, 1953, Brewer resigned from his IATSE position in a dispute with IATSE president Richard Walsh. In 1954, Brewer ran against Walsh for the presidency of the union, but Walsh was re-elected. ==Later life==