How to help stalin spread communism ?

Stalin spread communism at the point of a gun. He was a brutal monster who was worse than Hitler in many ways.

you must spy on others and tell stalin if anyone accuses him , you have to help persuade others that communism is a great and welcoming environment

you must allow Stalin to turn these countries into satellite states that would serve Soviet interests. you must also beware and secure the borders of the Soviet Union from future invasion.

ensure to establish friendly governments in the Eastern European states and turn them into satellite states. This would ensure that firstly, the states wouldn't rise up against the Soviet Union.