Menshevik

noun1

1. •
   (historical) A member of the gradualist or moderate wing of the Russian Social Democratic Labour Party during the years preceding the Russian Revolution, when they split with the Bolsheviks; or a member of a later independent moderate-Marxist party formed in 1917.

   • ‘Better an ultra-leftist than a Menshevik,’ said Rosa Kaletsky. — 1985