Otto Rühle (23 October 1874 in Großschirma – 24 June 1943 in Mexico) was a student of Alfred Adler and a German Marxist active in opposition to both the First and Second World Wars. He was a founder along with Karl Liebknecht, Rosa Luxemburg, Franz Mehring and others of the group and magazine Internationale, which posed a revolutionary internationalism against a world of warring states, and also the Spartacist League (Spartakusbund in German) in 1916.
The Spartacist League took an oppositional stance to Leninism, and was criticized by the Bolsheviks for inconsistency. Though Karl Liebknecht and Rosa Luxemburg were murdered in 1919 for their involvement in the German Revolution, Rühle lived on to participate in the left opposition of the German labour movement, developing both an early communist critique of Bolshevism, and an early opposition to fascism. Rühle saw the Soviet Union as a form of state capitalism that had much in common with the state-centred capitalism of the West, as well as fascism:
He also saw the Leninist Party as an appropriate form for the overthrow of Tsarism, but ultimately an inappropriate form for a proletarian revolution. As such, no matter what the actual intentions of the Bolsheviks, what they actually succeeded in bringing about was much more like the bourgeois revolutions of Europe than a proletarian revolution: