Rosa Luxemburg was a Marxist theorist, philosopher, economist, anti-war activist, and revolutionary socialist of Polish-Jewish descent who became a naturalized German citizen. She was, successively, a member of the Social Democracy of the Kingdom of Poland and Lithuania, the Social Democratic Party of Germany, the Independent Social Democratic Party, and the Communist Party of Germany. In 1915, after the SPD supported German involvement in World War I, she and Karl Liebknecht co-founded the anti-war Spartacus League, which eventually became the KPD. During the November Revolution she co-founded the newspaper Die Rote Fahne, the central organ of the Spartacist movement. She considered the Spartacist uprising of January 1919 a blunder, but supported it as events unfolded. Friedrich Ebert's majority Social Democratic government crushed the revolt and the Spartakusbund by sending in the Freikorps. Freikorps troops captured and executed Luxemburg and Liebknecht. Luxemburg's body was thrown in the Landwehr Canal in Berlin. Due to her pointed criticism of both the Leninist and the more moderate social democratic schools of socialism, Luxemburg has had a somewhat ambivalent reception among scholars and theorists of the political left. Nonetheless, some have regarded Luxemburg and Liebknecht as martyrs of the socialist cause.

https://en.wikipedia.org/wiki/Rosa_Luxemburg