Communism kind-of smeared itself. Everywhere where communism has been tried on a national scale, it has become authoritarianism.
Maybe it would be a good thing if done to the letter of the principle, but just like Libertarianism or Anarchism, it seems to be incompatible with human nature, at least so far.
But, socialism isn’t even a foreign idea. A lot of US institutions are socialist. The mail delivery is done by an arm of the government. Streets are paved by the government. Firefighters are government employees. The water delivered to your house is almost certainly by a government-run entity. People retiring without having saved enough are taken care of by the government. There’s medicare and medicaid.
A full capitalist system would have nothing done by the government that could be done by a business. No FDA, Pinkertons instead of Police, most army functions handed over to private contractors, every road privately owned and maintained, etc.