Poor farming practices
It was called Genocide by anyone who told the Truth. It was completely intentional.
Wow there's that "6 million" hmmmm.. and a full decade before 'Hitler'.
The Bolshevik/Soviet 'leadership' was not Russian. They hated Russians.
If you want to know more, read some Aleksandr Solzhenitsyn.
Communists and national-socialists were brothers in ideology. The only difference was the target. The logic was the same.
Those people destroying Russians, hated Russia because for them "proletary" was their kin. Why not destroying Russians?