Karl Korsch was a German Marxist theoretician and political philosopher. He is recognized as one of the "dissidents" that challenged the Marxism of the Second International of Karl Kautsky, Georgi Plekhanov and Lenin. Along with György Lukács, Korsch is considered to be one of the major figures responsible for laying the groundwork for Western Marxism in the 1920s.

György Lukács was a Hungarian Marxist philosopher, literary historian, literary critic, and aesthetician. He was one of the founders of Western Marxism, an interpretive tradition that departed from the Soviet Marxist ideological orthodoxy. He developed the theory of reification, and contributed to Marxist theory with developments of Karl Marx's theory of class consciousness. He was also a philosopher of Leninism. He ideologically developed and organised Lenin's pragmatic revolutionary practices into the formal philosophy of vanguard-party revolution.