イヴァン雷帝の通称はなぜつけられましたか？
Ivan the Terrible (born 1911) is the nickname given to notorious guard Ivan Marchenko, at the Treblinka extermination camp during the Holocaust. The moniker alluded to Ivan IV, also known as Ivan the Terrible, the infamous Tsar of Russia. "Ivan the Terrible" gained international recognition from the 1986 John Demjanjuk case. Already in 1944 a cruel guard named "Ivan", sharing the distinct duties and the extremely violent behavior with a guard named "Nicholas", is mentioned in survivor literature ("Rok w Treblince" by Jankiel Wiernik, translated into English as "A Year in Treblinka" in 1945); however, very little is known about Ivan Marchenko. John Demjanjuk was accused first of being Ivan the Terrible at the Treblinka concentration camp, but in 2011 he was accused of war crimes as a different guard named Ivan Demjanjuk who served at the Sobibor extermination camp.
extremely violent behavior