Who is Joseph Stalin?

I am wondering if you have tripped across some criticism that included the name of Joseph Stalin because the author of 1984, George Orwell, also wrote Animal Farm which does characterize and criticize Stalin allegorically.

In Orwell's early years, he was increasingly impressed by the ideas of socialism, as defined by Karl Marx. However, when he begun to watch the execution of Communism and how terribly the idea of it got distorted he was mortified. This caused him to intensely criticize Stalin's perversion of socialism.