Real communism (not the ideal one) do not work the way you think. US, as well as Canada, is actually a lot more communism than real communism countries. The definition of communism is that you work for the "common". In North America, if you are too rich, then you get heavily taxed and some of your money go to the government, or the common. From there, it'll go to the poor who are in need of the money. That's exactly how communism suppose to work.

But in real communism countries, there are no tax and there are no support from the government. The rich only gets richer and the poor only gets poorer (one reason why China, although fastly developing, have an unstable society, you see bicyles and S-class driving on the same streets everyday).

Communism only works for it's time period, it's now outdated. North Korea is the only TRUE communism in the world right now (China is more theoretical, you can own property and multibillion dollar businesses) and that's why they will eventually collapse unless they change it. Communists are great fighters but not great rulers.