yes, there are the millions dead in various "cultural" and agri-"cultural revolutions, the millions dead in gulags because they opposed the horrors of communism. i grew up in it, and it makes me vomit when someone mentions that murderous ideology.
It's probably the most tried and failed system in history. There are even examples that predate Marx - the Jamestown and Plymouth settlements.
It's perfectly legal in the US to set up a commune. The people who want it are free to give it a go.