highly recommend reading Losurdo's Stalin: History and Critique of a Black Legend. it's a very good historiography of stalin which dispels a lot of the western-propagated myths about his rule and the guy himself. near the end there's a very enlightening section about why "condemning" communist leaders and figures as somehow aberrations of communism is a dangerous road to go down. Stalin was not an aberration of communism, he was trying his best to further the cause and by all accounts he did quite a good job. we can critique without performing such a binary disavowal, ultimately that is liberalism