My friend, who is actually a great nationalist, thinks that the one of most important thing is that in order to get more power Stalin killed most of the old bolshevik scum, left from 1920-s, and stopped more revolution, thus providing more stability in society. In 1917-1920 they (bolsheviks) killed other people, in 1930-s they started to kill themselves. Although Stalin himself was an old bolshevik scum and not many people justify him.