communist, n. anyone who disagrees with me on any matter. Syn.: socialist, atheist, left-winger, right-winger, fascist, capitalist, racist, neocon.
True story: Someone once called me a fucking communist for advocating reduced government intervention in the automobile industry. When I asked him whether people wanting increased government involvement were fucking Libertarians, he gave me that all-purpose scathing rebuttal known as pretending not to have heard the question.