Johannes "Hans" Max Clemens (February 9, 1902 – September 9, 1976) was a German functionary of respectively the SS, Sicherheitsdienst (SD, Security Service) was primarily the intelligence service of the SS and the Nazi Party in Nazi Germany.
Clemens, together with other SS officers, including Herbert Kappler, Karl Hass, Carl-Theodor Schütz, and Erich Priebke, formed the first firing squad, which shot the first 12 victims.
[1][2] Clemens joined the Gehlen Organization and with Heinz Felfe, started feeding information to the Soviets.
[3] Before this work was discovered, he worked with the successor of the Gehlen Org, the Bundesnachrichtendienst (Bundesnachrichtendienst (Federal Intelligence Service, BND), the foreign intelligence agency of the modern German government, under the control of the Chancellor's Office).
[5] Clemens and Felfe admitted to having transmitted great amounts of secret information to the Soviets, including 15,000 classified documents.