Simcha Rotem (born Simcha (Szymon) Rathajzer, also known by his nom de guerre Kazik; 24 February 1924 – 22 December 2018) was a Polish-Israeli veteran who was a member of the Jewish underground in Warsaw and served as the head courier of the Jewish Fighting Organization (ŻOB), which planned and executed the Warsaw Ghetto Uprising against the Nazis. He was one of the last two surviving Jewish fighters in the Warsaw uprising and the last surviving fighter from the 1943 Warsaw Ghetto Uprising. Early life Rotem was born in 1924 in Warsaw, Poland. He experienced antisemitism early in his life and was a member of the Akiva Zionist youth movement. The Second World War As World War II broke out, Rotem was injured in a German bombing campaign which struck his family home. His brother and several members of his family were killed. The Warsaw Ghetto In 1942 he joined the Jewish Fighting Organization (ŻOB). Rotem became particularly useful as a courier for the Warsaw Ghetto fighters. He had the nickname "Kazik"—an abbreviation of a Polish name "Kazimierz" (Casimir), which means in Polish "someone who destroys opponent's prestige/glory during battle". The Warsaw Ghetto Uprising and aftermath As a ŻOB member, Kazik took part in the Warsaw Ghetto Uprising. He became the head courier, reporting directly to the ŻOB commander on the Gentile side, Yitzhak Zuckerman. The ŻOB commander in general was Mordechai Anielewicz. When it became apparent that the Germans would prevail, he was sent via a secret passageway to the Gentile side of Warsaw where he met with Zuckerman to arrange an escape for the fighters. However, the passageway was discovered by the Nazis. Unable to return, he and Zuckerman were trapped on the Gentile side while the fighting raged and the ghetto burned. Desperate to reach his comrades, Rotem made several attempts to enter the ghetto through the sewers before finally succeeding. There he encountered Zivia Lubetkin, one of the last surviving leaders of the ghetto uprising, and he led her with her team of approximately 80 fighters through the sewers to the Gentile side and then to the forests outside of the city. Throughout the rest of the war he continued his underground activities with the resistance, in particular helping to care for the several thousand Jews, who still remained in Warsaw in hiding. In August 1944, he took part in the Polish Warsaw Uprising. In July