The leading cadre of the SDKPiL were a famous group, many of whom would play a role in the Russian Revolution of October 1917. Chief among them was Rosa Luxemburg, the leading theoretician of the movement. Other notable figures included Leo Jogiches, Julian Marchlewski, Adolf Warski, Felix Dzerzhinsky, Stanisław Pestkowski, Karl Sobelson, Józef Unszlicht, Kazimierz Cichowski and Jakob Fürstenberg. Internationalists, many of them would play leading roles in Germany as well as in Russia.