Who were they following?
In all seriousness though - Poland is an obvious choice, absent the victory at Warsaw. If that happens, there is a chance the Baltic countries might fall as well. If Attaturk dies and the Greeks do really really well, Turkey might turn red. This is about it.
Hungary has no chance of staying commie. Romania and Czechoslovakia have no chance of turning commie. Ditto Germany.
Saying Germany has no chance of going red when there was actual an attempted revolution that could have succeeded had they put themselves to more careful planning and preparation. I don't think that's inconceivable. But I do agree that Hungary, Romania, Czechoslovakia, and many east european nations rested on the involvement of Germany and Russia actively intervening in the situation.