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In page Mordechai Anielewicz:

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After the first reports of the mass murder of the Jews spread at the end of 1941, Anielewicz began immediately to organize defensive Jewish groups in the Warsaw Ghetto. His first attempt to join the Polish resistance, subject to the Polish exile government in London, ended in failure. In March 1942, Anielewicz was among the founders of the anti-fascist group. Even it did not have a long duration and eventually, it was dissolved.[citation needed]