Lenin's wife Nadezhda Krupskaya said in 1926 "Lenin was only saved from prison by his death" and Leon Sedov (Trotsky's son) said "When Lenin was writing his Testament, he was far from being able to imagine just how far Stalin’s abuse of power would go. Yes, if Lenin were alive, he would not only be in prison, but he would have been declared the first and foremost terrorist!".
So what if Stalin purged Lenin or had him assassinated but everyone deep down knew who did it?