In 1945, the FBI raided a warehouse in Los Angeles that was used for storage by the German Consulate. Among the files, they found a collection of 3×5-inch cards kept by the Nazi regime containing contact information for important people in LA. The cards included the names, addresses, and phone numbers of people in the entertainment industry, academia, and industry. And it serves as a terrifying reminder that the normalization of the Nazis in the 1930s provided cover for some very powerful people in the US to be friendly with genocidal maniacs.
Source: Gizmodo – The Nazis Kept a List of Powerful American Friends in Los Angeles, Including the Co-Founder of UCLA