> In the 1920s Russia was experiencing its first famine that could reasonably be attributed to communism
There were no famines in the USSR from 1947–1991, but there was a variety of considerations such as monarchy, civil war, 2 world wars, and anti-communist sanctions from the 1890-1947 period, so if anything, it appears that the evidence would imply communism ended the famines, not caused them.
Certainly communism did eventually stop causing famines in the Soviet Union, but the Holodomor personally overseen by Stalin was worse than any Tsarist famine. And we have many other examples of communism causing famine: Mao's Great Leap Forward caused history's worst famine, for example (history's only famine worse than Stalin's Holodomor), but also, for example, the Ethiopian famine many of us remember from the 80s was caused by the Derg (who were technically socialist rather than communist), and one aspect of Pol Pot's democide in Cambodia was a famine, as well.
There were no famines in the USSR from 1947–1991, but there was a variety of considerations such as monarchy, civil war, 2 world wars, and anti-communist sanctions from the 1890-1947 period, so if anything, it appears that the evidence would imply communism ended the famines, not caused them.