1. A political movement that distributed wealth amongst all citizens, preventing social hierarchy.
Most famously seen in the USSR, and modern China. The concept was invented by Karl Marx, and was described in his book "The Communist Manifesto".
2. A buzzword used in the 1960s by Americans, used to describe something you didn't like. Due to a collision of freedom of thought, and the tensions with the USSR in the east
Something that the United States will eventually be, if it isn't yet. You can deny it all you want and many people do in fact deny it, but it cannot be helped.
Abel: Did you hear about Jeffery and Kelly?
Tasha: Yes, I recently heard that they are Communist.
Abel: They were probably Communist long before, but we didn't find out until just recently.
Tasha: That would definitely not surprise me at all and it actually doesn't.