Roy Martin Brewer (August 9, 1909 – September 16, 2006) was an American trade union leader who was prominently involved in anti-communist activities in the 1940s and 1950s.

[3] In 1936, Brewer worked on the re-election campaign of Nebraska senator George W. Norris, a former Republican who had left the party and was running as an independent.

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.

[5][6] 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.

[3][7] 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.