I just picked one egregious example to compare to Korolev and other researchers that suffered. If you want to compare systemic examples like the Gulags then the Jim Crow system that effectively instituted slavery [1] and likely killed way more than 1.7 million people. Alabama alone imprisoned 200,000 blacks as effectively slaves[2].

Again I am not trying to dismiss the crimes of the Soviet Union but I almost never see the same analysis applied to the US.

[1] https://www.aclu.org/news/human-rights/captive-labor-exploit...

[2] https://www.newsweek.com/book-american-slavery-continued-unt...