https://berniesanders.com/medicare-for-all/
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“'The United States is the only major nation in the industrialized world that does not guarantee health care as a right to its people,' Sanders said. 'Meanwhile, we spend far more per capita on health care with worse results than other countries. It is time that we bring about a fundamental transformation of the American health care system.'”
Since socialism is a transitory phase between capitalism and communism, it has never failed because it has never been attempted in appropriate circumstances.
"For Marxists, socialism or, as Marx termed it, the first phase of communist society, can be viewed as a transitional stage characterized by common or state ownership of the
means of production under democratic workers' control and management, which Engels argued was beginning to be realised in the
Paris Commune of 1871, before it was overthrown.
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"Socialism to them is simply the transitional phase between
capitalism and 'higher phase of communist society'. Because this society has characteristics of both its capitalist ancestor and is beginning to show the properties of communism, it will hold the means of production collectively but distributes commodities
according to individual contribution."
https://en.wikipedia.org/wiki/History_of_socialism#Marxism_and_the_socialist_movement