Bolshevik
/ˈbəʊlʃɪvɪk/
Definition 1 of 2
Pro Tip 1/3Historical Origin
Understand that 'Bolshevik' originated from a group that changed Russian history. 
My history class covers how the Bolsheviks sparked the October Revolution.
Pro Tip 2/3Political Context
Bolsheviks were tied to radical changes and communist ideas in Russia. 
The Bolshevik ideology was influential throughout the 20th century.
Pro Tip 3/3Not Contemporary
The term is historical and not used for current political groups. 
Bolshevik policies were studied, but no modern parties are called Bolsheviks.