How much of an affect communism has on the world?

Some people argue that communism has no effect on the world,but I believe it has a huge effect on us.
In the book Animal Farm, is about farm animals overthrowing the farmer and taking over the farm, but what the animals don't realize that when they get rid of the farmer they can't milk the cows , feed themselves, or anything and they need it to survive so they are still going to die.