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Education and activism

In 1884, she enrolled at an all-girls' gymnasium (secondary school) in Warsaw, which she attended until 1887. The Second Women's Gymnasium was a school that only rarely accepted Polish applicants and acceptance of Jewish children was even more exceptional. The children were only permitted to speak Russian. At this school, Róża attended in secret circles studying the works of Polish poets and writers; officially this was forbidden due to the policy of Russification against Poles that was pursued in the Russian Empire at the time. From 1886, Luxemburg belonged to the illegal Polish left-wing Proletariat Party (founded in 1882, anticipating the Russian parties by twenty years). She began political activities by organising a general strike; as a result, four of the Proletariat Party leaders were put to death and the party was disbanded, though the remaining members, including Luxemburg, kept meeting in secret. In 1887, she passed her matura (secondary school examinations).

Róża became wanted by the tsarist police due to her activity in Proletariat; she hid in the countryside, working as private tutor at a dworek. In order to escape detention, she fled to Switzerland through the "green border" in 1889. She attended the University of Zurich (as did the socialists Anatoly Lunacharsky and Leo Jogiches), where she studied philosophy, history, politics, economics, zoology and mathematics. She specialised in Staatswissenschaft (political science), economic and stock exchange crises, and the Middle Ages. Her doctoral dissertation "The Industrial Development of Poland " (Die Industrielle Entwicklung Polens) was officially presented in the spring of 1897 at the University of Zurich which awarded her a Doctor of Law degree. Her dissertation was published by Duncker and Humblot in Leipzig in 1898. An oddity in Zurich, she was one of the first women in the world with a doctorate in political economy and the first Polish woman to achieve this.

In 1893, with Leo Jogiches and Julian Marchlewski (alias Julius Karski), Luxemburg founded the newspaper Sprawa Robotnicza (The Workers' Cause) which opposed the nationalist policies of the Polish Socialist Party. Luxemburg believed that an independent Poland could arise and exist only through socialist revolutions in Germany, Austria-Hungary and Russia. She maintained that the struggle should be against capitalism, not just for Polish independence. Her position of denying a national right of self-determination provoked a philosophic disagreement with Vladimir Lenin. She and Leo Jogiches co-founded the Social Democracy of the Kingdom of Poland and Lithuania (SDKPiL) party, after merging Congress Poland's and Lithuania's social democratic organisations. Despite living in Germany for most of her adult life, Luxemburg was the principal theoretician of the Social Democracy of the Kingdom of Poland (SDKP, later the SDKPiL) and led the party in a partnership with Jogiches, its principal organiser. She remained sentimental towards Polish culture, her favourite poet was Adam Mickiewicz, and she vehemently opposed the Germanisation of Poles in the Prussian Partition; in 1900 she published a brochure against this in Poznań. Earlier, in 1893, she also wrote against the Russification of Poles by the Russian Empire's absolutist government.