Leon "Leo" Jogiches, also commonly known by the party name Jan Tyszka, was a Polish-Jewish Marxist revolutionary and politician, active in Poland, Lithuania, and Germany.
Jogiches as a young man, circa 1880s
The domineering "father of Russian Marxism" Georgy Plekhanov quickly became a lasting enemy of the young Jogiches
Jogiches was the editor of the illegal Spartacus newsletter, launched in September 1916, from which the underground Spartakusbund took its name
Julian Baltazar Józef Marchlewski was a Polish communist politician, revolutionary activist and publicist who served as chairman of the Provisional Polish Revolutionary Committee. He was also known under the aliases Karski and Kujawiak.
Julian Marchlewski's grave at the Powązki Military Cemetery in Warsaw
Monument to Julian Marchlewski