Did Joseph Stalin do anything important for the world?

Answer 1

By "important" I will take the question to refer to something both important and beneficial to the world. About the only item fitting both categories is that he helped win World War 2 against Germany by fighting off Adolph Hitler and the German Army when they invaded Russia. By putting up a successful war effort on Germany's eastern front, Stalin forced Germany to divide its military forces between its fight against Russia in the east and the United States, Great Britain, France and the other Allies in the west.

Aside from that, and this is just personal opinion, the only other important and beneficial thing he did for the world was dying, although that might not really count since he didn't do that intentionally.