The truth of the matter is that any revolutionary move from a capitalist economy to a communist/ radical socialist one, even today would involve loss of life and massive social upheaval.
In the context of the second world war, and the concerted attack on Russia by the "Axis powers", the results are unsurprising.
China has lifted many millions of people out of poverty through the pursuit of socialist policies and curtailment of what we regard as democratic institutions. The Chinese government now appear to be relaxing some of their economic structures, but the people have learned the value of self discipline, while we demand more personal freedom without regard to our perilous economic situation.