to Robert Havemann, one of the founders of the German Resistance group, the European Union, Hatschek was a leading member of the group. Havemann said Hatschek was under surveillance for years and that this fact was what led to the group's discovery by the Gestapo. In 1943, the Gestapo observed Hatschek meeting two parachute landings. After an investigation, they arrested Hatschek and his wife, Elli, on 3 September 1943. The Gestapo began an intensive interrogation of him that same day. Under interrogation, Hatschek revealed names of other group members and two days later, the Gestapo arrested every person Hatschek had named. By the end, they had arrested over 40 European Union members. Hatschek was tried with his daughter, Krista Lavíčková, a secretary, on 27 March 1944 and was sentenced to death at the Nazi "People's Court" (Volksgerichtshof). He was executed on 15 May 1944 at Brandenburg-Görden Prison. On 4 November 1944 the People's Court brought his wife to trial for her connections to the European Union and Wehrkraftzersetzung and sentenced to death. She was executed on 8 December 1944 at Plötzensee Prison. His daughter was executed at Plötzensee Prison on 11 August 1944. Published work "Grundlagen des Tonfilms", Halle (1931); 5th edition, Halle (1942); 9th -11th editions, Halle (1950) "Die Rhytmographie" in: Filmtechnik/Filmkunst, 7/7 (7 February 1931), 6-8 "Was muß jeder vom Tonfilm wissen?" Leipzig (1933) with Rolf Wigand, "Niederfrequenzverstärker: Planung, Berechnung und Bau von Niederfrequenzverstärkern und Verstärkeranlagen", Berlin (1933) "Die Photozelle im Dienst der Tonfilmwiedergabe", Halle (1933), 2nd -4th editions (1948) "Darf der Radiohändler Lautsprecher für Tonfilmzwecke verkaufen?" in: Elektroton und Schallplatte. Beilage für Kraftverstärker, Nadel- und Lichttonwiedergabe, (=Beilage von Der Radio-Händler), Nr. 1, (1935) p. 77f "Die Wunder der Zeitdehnung und Zeitraffung" in: Die Filmwelt (30 August 1936) "Fortschritte der Funktechnik und ihrer Grenzgebiete". (Handbuch der Funktechnik und ihrer Grenzgebiete / Revised and edited by M. v. Ardenne ; W. Fehr (and others). Vol. [4 = Erg. Vol. 1]. Stuttgart (1936) Optik des Unsichtbaren, Eine Einführung in die Welt der Elektronen-Optik, Stuttgart (1937) with Rolf Wigand, Niederfrequenz-Verstärker und Uebertragungsanlagen. 2nd edition Berlin (1938) "Neue physikalische Erkenntnisse im Dienst der Magie" in: Das neue Universum. Vol. 60, (1939) Radiotechnique. Les principes acoustiques et électriques et leurs applications. Written in collaboration by M.V. Ardenne, W. Fehr, Hanns Gunther, Paul Hatschek, Paul Jaray, E. Nesper, Th. Schultes, W. Steindorff, R. Thun, Rolf Wigand, H. Wigge. Translated from the German by R.