The theories of Karl Marx has made us to understand that an equal society is possible if the society work in unity. Search has shown that 80% of relationship between societies is strictly bias and profit minded which make it difficult for equal society to exist. The rich hate the poor to reach the class and the poor hate the rich for always staying at the top. A quote says: the rich cannot sleep because the poor are awakes and the poor can not sleep because they're hungry. This are part societies from the pictures of seeing people equal or leadership doubtlessly working towards equal societies. Is any society that practice equality laws and equity for oneness in all shared resource?
As of the moment, there is no real communist country per the definition of karl marx. Even China who is considered a communist country is more on a socialist than a communist. There will always be people who are more well of than the others and there are so many considerations before you can say that you achieve being a communist country (per the definition of karl marx). Maybe in the future we will see a communist country by the definition of karl marx but I am more leading that it is almost impossible and socialist country is a more achievable goal.