As a United States citizen, deHavilland became involved in politics as a way of exercising her civic responsibilities. She campaigned for Democratic President Franklin D. Roosevelt's ultimately successful re-election bid in 1944. After the war, she joined The Independent Citizens' Committee of the Arts, Sciences, and Professions, a national public policy advocacy group that included Bette Davis, Gregory Peck, Groucho Marx, and Humphrey Bogart in its Hollywood chapter. In June 1946, she was asked to deliver speeches for the committee that reflected the Communist Party linethe group was later identified as a Communist front organisation. Disturbed at seeing a small group of communist members manipulating the committee, she removed the pro-communist material from her speeches and rewrote them to reflect Democratic President Harry S. Truman's anti-communist platform. She later recalled, "I realised a nucleus of people was controlling the organisation without a majority of the members of the board being aware of it. And I knew they had to be Communists."