The Russian revolution was the most important event of the 20th century.
It was the most important event in the entire history of the working class. The working class took and held power in territory that covered one sixth of the globe.
That working class power was overthrown in the early-mid 1920s by the Stalinist counter-revolution, which though continuing to call itself "communist" and "working class" put in a brutal and savage state bureaucracy as a new ruling class over the working people.
That Stalinist "dictatorship of the bureaucracy" — brutal, exploiting class power pretending to be