The Case of Colonel Redl (1931)

Based on the short story "Der Fall des Generalstabschefs Redl" by Egon Erwin Kisch. Alfred Redl, a colonel on the Austrian General Staff, leads an extravagant private life. No one suspects that in reality he is passing information to Russian spies. Alternate-language version of "Aféra plukovníka Rédla" (1931).