In 1939, Warner Brothers studios released Confessions of a Nazi Spy, the first Hollywood film to confront the threat of German espionage in the United States. Going further, Jewish movie moguls paid private investigators to infiltrate Nazi groups in L.A, while establishing the Los Angeles Jewish Community Committee (LAJCC). Drawing on more than 15,000 pages of archival documents, Laura Rosenzweig reveals how the LAJCC—battling American anti-Semitism—partnered with organizations whose patriotism was unimpeachable to channel information regarding seditious Nazi plots to Congress, the FBI, and the Justice Department.