Compare and contrast of hitler stalin and mussolini

All of them were totalitarian leaders (totalitarian leaders- control all or most aspect of citizens lives)
I know that both stalin and mussolini used police spies
Stalin rules after lenin, lauches the great purge ( campain to anyone threatening his power )
Both Hitler and Stalin have labor camps
Mussolini formed facist party
All put strict censorship, government cortrol over the media and used propaganda

You might need to include the boxes first.