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Jankiel (Yankel, Yaakov, or Jacob) Wiernik (1889–1972) was a Polish-Jewish Holocaust survivor who was an influential figure in the Treblinka extermination camp resistance. He had been forced to work as a Sonderkommando slave worker there, where an estimated 700,000–900,000 people, mostly Jews, were murdered. After his escape during the uprising of 2 August 1943, Wiernik reached Warsaw and joined the resistance. Wikipedia