With Stalin out of the way, it is most likely that Trotsky would take his place but what if both were taken out of the picture? Leaving power in the Communist world to the hands of other notable names like Zioviev, Kamenev, Rykov, Radek, Bukharin, Pyatakov, etc. All of whom could have been the Soviet leader after Lenin. So how would history remember them were it not for their roles as victims of the Purges? What would they do as the leaders and builders of the USSR?
Say both Stalin and Trotsky are killed in the Civil War and Lenin dies around the same time in 1924. What happens from there?