Leo Jogiches

Leon "Leo" Jogiches (German: "Leo Jogiches"; Russian: Лев "Лео" Йогихес; 17 July 1867 – 10 March 1919), also commonly known by the party name Jan Tyszka, was a Marxist revolutionary.
Jogiches was a founder of the political party known as The Social Democracy of the Kingdom of Poland in 1893 and a key figure in the underground Spartacus League in Germany.