There were an estimated 7 to 12 million casualties during the war, mostly civilians (https://en.wikipedia.org/wiki/Russian_Civil_War).

A total of 1,053,829 people died in the Gulag not including labor colonies (https://en.wikipedia.org/wiki/Excess_mortality_in_the_Soviet...).

The Communists didn't prey in some vaguely psychological sense, they physically exterminated anyone who disagreed.