I'm not sure if you are being serious or not, but just in case: many versions of communism and socialism have been tried. When introduced at a country level, no

I'm not sure if you are being serious or not, but just in case: many versions of communism and socialism have been tried. When introduced at a country level, not only didn't they eradicate mass poverty or class inequalities (they just got other names), but for some reason they came with totalitarianism, violence, restricting freedom of speech, prosecuting enemies and other side-effects. The cases where it (kind of) worked were local communes like Longo Mai (but even in these cases people argue because they receive donations, use external medical care etc.). The key difference in my opinion is that for any ideology to succeed, all members need to believe in it and actively engage towards its success. It's pretty much feasible at a local level but extremely difficult at a state level.