What was adolf hitler role in world war 2 what was benito mussolini role in world war 2 what was joesph stalin role in world war 2

Adolf was the guy who got rid of the Jews and told Germany that the Jews were the problem and that he would fix Germany.
Benito was a dictator of Italy in World War 2.
Stalin kinda gave land to Hitler (Poland I think) and tried to take more, but Russia was too big and the Nazi's were not prepared for the cold climate and they got surrounded. 
This is all I got off the top of my head, hope this somewhat helped.

C.before he invaded rome