H. Keith Thompson

In his article "I Am an American Fascist" for the obscure Exposé magazine in 1954, Thompson praised the Third Reich and Hitler and condemned the Nuremberg Trials as "vicious and vilely dishonorable". He became linked to the International Association for the Advancement of Ethnology and Eugenics and published a number of pamphlets on its behalf.

Alongside his political activities, Thompson found work in public relations and owned a PR firm by the 1950s.

Thompson graduated from Yale University in 1946. He made an expedition to Antarctica as part of Operation Highjump under Rear Admiral Richard Evelyn Byrd.

The writer Stephen E. Atkins describes Thompson as "the intermediary between American prewar Nazism and the postwar neo-Nazism". Thompson befriended the German Nazi Otto Skorzeny, who had been Hitler's commando leader, and worked with him to set up ODESSA. Thompson also became a close ally of Otto Ernst Remer, a Nazi general who had defended Hitler against a 1944 coup plot, and in 1951, Thompson registered with the United States Department of Justice as the American representative for the German neo-Nazi Socialist Reich Party co-founded by Remer, a position Thompson held until the group was banned in 1952. Around the same time, he became involved with the National Renaissance Party, the American neo-Nazi party founded by James Madole. Thompson campaigned with Francis Parker Yockey for Remer's release from prison during the 1950s. Thompson and Yockey remained close allies until the latter's death in 1960. Thompson also ran a campaign to release Karl Dönitz, Hitler's successor. Thompson worked with neo-Nazi presses in South America to distribute literature covertly in Germany.

Thompson began his political activism in his teenage years, joining the German American Bund and the America First Committee, and campaigning against involvement before America's entry into World War II. He came to the attention of Nazi Germany and was appointed as a Special Agent of the Sicherheitsdienst (SD) Overseas Intelligence Unit on July 27, 1941, swearing a loyalty oath to Adolf Hitler.

Harold Keith Thompson (September 17, 1922 – March 3, 2002) was a New York City-based corporate executive, a Nazi agent, and a figure within American far-right and fascist circles.