As an aside, Stalin saw socialism as perhaps as big an enemy of communism as capitalism. He was deeply concerned that socialists would dilute the appeal of communism, and the purge (1936-38) was largely directed at alleged socialists--as well as Trotskyites, who were really communists, but Stalin didn't like Trotsky's challenge to his view of the proper version of communism. Side side note: Stalin was a bad guy. In case any of you forgot.
Also, socialized medicine, practiced in Japan, Canada, all of western Europe, etc., is hardly the camel's nose of communism (or even socialism, as CD has been referring to) creeping under the tent. That doesn't mean it's right for the US, just that I think the Brits and Canucks would laugh at the idea that they are teetering on a Mao-ist or Stalin-ist type dictatorship because of their health care systems.