Your understanding is not far off the mark. Darwin’s theories have been cited by socialists and Nazis to justify the practice of eugenics. Not the first time that tyrants have abused science, nor will it be the last.
False ....
Stalinist Russia rejected Darwinian evolution as "bourgeois" and instead embraced the non-Darwinian "proletarian biology" of Lysenko and Michurin (a disaster from which Russian genetics and biological sciences has still not completely recovered).
as for Hitler please see: Post #184
Hitler was clearly coming from a Creationist standpoint ... please note I am not comparing Creationists to Hitler or Stalin ... I am merely refuting common false claims made by Creationists ...