Or are you one of those people who uses Socialism and Communism interchangeably?
Well, communists themselves do it all the time. You had all these 'socialist republics' down in Eastern Europe a while ago. Ofcourse, there's a substantial amount of difference between social democracy, socialism and communism. While socialism isn't quite as authoritarian as communism, it is rather undemocratic. Here in the Netherlands, we had a 'scandal' half a year ago about how the dutch Socialist Party (that's it's name, and it fits perfectly) suppressed party members wo didn't follow the party leader's line.