In 1939 the Los Angeles Jewish Community Committee established the News Research Service to further expose subversive groups under investigation. Edited by Joseph Roos, the News Letter used the Committee's extensive research files to provide highly regarded and detailed intelligence reports and analyses of propaganda. It reached a limited but important audience of writers, organizations and journalists (Walter Winchell, Drew Pearson, Robert Allen). These readers used the well-documented stories to alert the American Public about the threat of pro-Nazi and anti-Semitic groups.
After the United States entered World War II, the focus of JCC's activities changed from intelligence gathering and investigative journalism to community relations. In 1941, JCC changed its name to the Community Relations Committee (CRC) of the Jewish Federation Council of Greater Los Angeles. The CRC actively supported groups engaged in "Americanism" work, such as the American Legion and the Boy Scouts. In Los Angeles, the Committee participated in the creation of the Council for Civic Unity, the Bureau of Intercultural Education and the Supervisor's Committee for Interracial Progress. The CRC dedicated itself to establishing strong programs of interfaith and interracial unity.Many organizations rose to the challenge of resisting the "enemy within." The Los Angeles Community Relations Committee served as a model for other organizations nationwide in the continuing fight to overcome discrimination.