Communism is described as being the theory of there being a state free of class, money, stateless society with the common ownership of resources and their means of production. It is also referred to as the government type which seeks to bring this change about. Or any government of left/far-left leaning that wins this monoker from Spain.
Communism is born from the theories of Karl Marx. And in PoW based loosely on the surviving teachers of Vladimir Lenin. Communism in PoW has also taken on new theories such as that of Houism.