I know it's mindboggling, but really there aren't. This is one thing that Westerners typically don't get about the Communist-bloc countries, or don't seem to care. Whereas in average the standard of living was always much higher in Capitalist countries, if you looked at the Eastern European Communist bloc for example, there's no extreme poverty, because the state takes care of that (and it's an extremely important thing for the State to take care of, or else the population would come to believe that Socialism wasn't working). Sure, being an average American in the 70s would be a lot more comfortable than being an average Pole in the same period — but there were no people living under bridges in Poland scrapping food from trashcans. If you ask the poorest people of any Capitalist country whether they'd switch places with the poorest ones of a Communist country, they'd do it in a heartbeat.
Of course, this idea gets lost to the mind of the Western middle class because in general they just don't think about the poorest members of their society (or some just think they deserve their fate).
The Communist era had numerous well-documented flaws, but really, the things it got right aren't spoken about enough in the West. We could learn something from that. For example, the levels of education of the population in the Soviet Union were never attained in the United States. How do we fix that in the Capitalist system? Do we want a more educated population in the first place? Do we want to live in a society with no children in the streets? If we do, what do we have to change in our society to attain that? It's important not to take a whole system for granted as a full package ignoring its flaws, be it Communist or Capitalist.
But indeed, the saying _is_ correct: "Millions of children will sleep on the streets tonight. None of them is Cuban."