The Collaborative International Dictionary of English v.0.48:

bolshevism \bolshevism\ n. [see Bolshevik.]
   a form of communism based on the writings of Marx and Lenin.

   Syn: collectivism, Marxism-Leninism, Leninism, Marxism,
        Sovietism, sovietism.
        [WordNet 1.5] bolshie

WordNet (r) 3.0 (2006):

Bolshevism
    n 1: Soviet communism [syn: Bolshevism, collectivism,
         sovietism]