It's easy to do "pretty well" in the early years, the books can be cooked, the standards changed, etc. But over time you can't hide failure.
Cuba: thousands executed for the ideas they held; forced labor camps; and more than 1.2m fled 1959-1993 (about 10% of the current population). "Doing pretty well". Cuba was one of the wealthiest countries in the Americas, before Marxists took over.
England: English colonialism from Drogheda to Amristar, plus the domestic Peterloo, child labor etc. Also, how many millions did England deliberately starve to death in the 1840s?
Germany: I can list off what the Krupp/Voegler/Thyssen financed Nazi party did for a while, then go back to before that