Alexander Bogdanov was a non-Leninist Bolshevik who also wrote science-fiction.

The terms “Bolshevism” and “Leninism” are usually treated as synonyms. In view of Lenin’s enormous influence over the Bolshevik party, that might seem fair enough. But in fact Lenin did have political and intellectual rivals inside his own party. The most important of these non-Leninist Bolsheviks was Alexander Bogdanov (1873-1928).