Not published by Marx during his lifetime, they were first released in 1927 by researchers in the Soviet Union.
Lenin's most important philosophical rival was Alexander Bogdanov (1873-1928), who tried to synthesize Marxism with the philosophies of Ernst Mach, Wilhelm Ostwald, and Richard Avenarius (which were violently criticized in Materialism and Empiriocriticism).
Soviet Union | European Union | Union Army | rugby union | Doctor of Philosophy | philosophy | Union | Philosophy | International Telecommunication Union | trade union | Soviet Navy | Union (American Civil War) | Union Pacific Railroad | England national rugby union team | American Civil Liberties Union | Wales national rugby union team | New Zealand national rugby union team | Ireland national rugby union team | Western Union | Scotland national rugby union team | International Astronomical Union | Georgia national rugby union team | Trade union | Soviet Army | International Union for Conservation of Nature | Border Union Railway | France national rugby union team | United States national rugby union team | South Africa national rugby union team | Communist Party of the Soviet Union |