Socialism has existed, that's what the USSR was. It was an ML Socialist state, but it failed to become a Stateless, Classless, Moneyless society. In other words, it failed to reach Communism. Communism has been attempted, but never reached. It never reached the Communist stage, so Communism itself hasn't been tried, only the ML form of Socialism.

The Soviet Union doubled life expectancy from the mid 30s to the mid 70s, had constant GDP growth until it liberalized and collapsed, guaranteed free Healthcare and education, and had mass housing initiatives. It had far lower wealth inequality than before or after its existence. This is all freely available information.

Am I a USSR Stan? Fuck no, the Politburo was a corrupt mess and Stalin was a thug. However, you've completely misconstrued my argument.