From the usage examples for the word Hitlerist; the quote is from David's post Data on Mass Murder by Government in the 20th Century:
2022
Although the party had explicitly Stalinist and Hitlerist roots, the deaths are not assigned to either ideology.
Newstex Blogs: Volokh Conspiracy (Nexis) 9 November
Big time! Reason also makes it with an example of "puppycide" (in an article by Radley Balko):
