Born into a wealthy Abony family, Endre obtained a degree in political science after service in the First World War and became a leading local government officer in Pest county.

[1] He became involved in the right wing nationalist society Magyar Országos Véderő Egyesület (MOVE) during which he became noted for his extreme cruelty, which may have been a result of syphilis.

[1] A top priority for the country's new Nazi rulers was the annihilation of Hungary's Jewish population, which despite repression and economic hardships had survived the first years of the war largely intact.

[1] Along with László Baky, Endre and Jaross eagerly helped Adolf Eichmann amass and deport more than 400,000 Hungarian Jews between May and July 1944.

[1] In December 1945 Endre, Baky and Jaross (now known as "the deportation trio") were tried in Budapest and found guilty of the murder of Jews, and of acting against the national interests of Hungary.