Flag of the Helvetian Confederation of Socialist Cantons, founded in 1945. Basically, the Soviets in WWII conquered all of Austria and North Italy, and the Swiss are affected.
I doubt the Swiss would agree to live under communist tyranny - they would stand up and cause the Bolsheviks serious casualties. Just like the Afghani defeated the Soviets in 1989.
Also, Switzerland is staunchly capitalist if anything else. Being the world's bank vault, a lot of foreign interests wouldn't be pleased with this new arrangement. Then again, if the Communists were to take the world's center of finance and banking, it would hasten the spread of the ideology.