For Nazi history in US buffs like me, a very interesting report by Commander Kenneth T. Klima, U. S. Navy was put forth in 2024 in the form of an MA thesis at Harvard University.

The effectiveness of Nazi-era espionage in the US had been downplayed. But his review of a declassified intelligence batch in the early 2000s appears to tip that over.

In his abstract, Klima writes, "Comparative analysis that pits this historical misunderstanding against declassified archival primary sources only available within the last two decades reveals an Abwehr that was far more present and capable within the United States, and the results of its espionage activity had tangible impacts prior to and during the U.S. participation in the war."

According to his biographical sketch, as of 2024, Klima "spent over 27 years working in the fields of history, military science, and intelligence. For over two-and-a-half decades he served as a commissioned intelligence officer in the United States Navy, and in addition to his assigned duties, developed a fascination for the study of the history of intelligence and warfare."

The 397-page thesis online is a must-read here, as background material regarding my research into social set / business Nazi activity across the US. This buried history so far includes San Diego to San Francisco, Cleveland, and New York - Connecticut. (See here and here for many articles at the AFP-sister publication The Connecticut Centinal. Elsewhere, historian Bradley Hart is looking at New Orleans and pulling declassified intel (see the AFP report with video of presentation here). Also see a shocking documentation compilation page about the historically buried tour of America by a high-level Hitler ally in March-April 1940, while the US was still neutral.

Were a number of higher-end folks across the country too close to Nazi agents in the U.S. AFTER WWII began? Yes.