> 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.