The wanton slaughter of people comes to mind real quick.
The Bolsheviks understood that simple wealth redistribution wouldn't work....the rich would get all their money back within a few short years, so nothing would change....therefore the only way to achieve the change would be to simply murder them en masse. Deep down all true Communists believe that this is the only to bring about the Revolution, they will deny it, but they all truly think that way.
They spawned the killing of 80 to 100 million people all over the world. Read “The Black Book of Communism” it is time well spent.