Karl Josef Silberbauer (21 June 1911 – 2 September 1972) was an Austrian police officer, SS-Oberscharführer (staff sergeant), and undercover investigator for the West German Federal Intelligence Service. Silberbauer is best known, however, for his activities in Nazi-occupied Amsterdam during World War II. During his time in Amsterdam, he got promoted to the rank of Hauptscharführer (master sergeant). In 1963, Silberbauer, by then an Inspector in the Vienna police, was exposed as the commander of the 1944 Gestapo raid on the Secret Annex and the arrests of Anne Frank, her fellow fugitives, and their Gentile protectors. Wikipedia
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