JOGICHES, LEON (Jan Tyszka; 1867–1919), socialist leader in Poland and Germany. Born in Vilna, Jogiches in 1885 became a member of the revolutionary party Narodnaya Volya. He was a leading member of the Vilna group and was connected with its terrorist organization. He was later arrested by the Czarist authorities. On his release he emigrated to Switzerland and from 1890 to 1893 worked with Plekhanov's Marxist group Osvobozhdeniye Truda ("Emancipation of Labor"). Jogiches was a founder and leader of the Social Democratic Party of Poland and Lithuania and considerably influenced Rosa *Luxemburg, with whom he was in close personal contact. He edited the party organ Sprawa Robotnicza
J. Krasny, J. Tyszka, zarys życia i dziaxalności (Moscow, 1925); Polski Słownik Biograficzny, 11 (1964–65), 260–2 (incl. bibl.).
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