u/Assassin4nolan - originally from r/GenZhou
I'll try and get readings in a sec, but the general gist is that the USSR did move around various ethnic populations for various reasons, mostly during WW2 to try and prevent a 5th column (5th column in the USSR refers to potential fascist collaborators)
For instance, the USSR famously moved 1-2 (1.5 maybe) million Jews from Poland, baltics, and western USSR to the eastern USSR to put them out of the nazi war path, forseeing the holocaust.
Aswell as this, ethnic germans and chechens were reported as having high amounts of fascists and collaborators in their communities, and were moved in the tens/hundreds (depending on who you ask) of thousands across the USSR to move them away from the front. Molotov himself has made statements on why this was done and why he believed it justified at the time, while acknowledging excesses and collateral deaths.
I think the main problem with this topic is that both numbers of those moved, and of those who died while moving are unreliabally sourced by anti Soviet sources, there are probably reliable numbers if you can read Russian and dig deep enough, but anything that posits that Stalin perosnally, stalin alone, stalin malevolently, commanded something due to ethnic chauvinism is overtly an anti communist lie.
This book has a chapter (13) dedicated to deportations, I'm sure it has plenty enough direct document sources