score:5
Your link now brought me to the me too discussion on Quora. I advise to post a better link in your question.
Donβt know if this is what you are looking for but Stalin and his organisations structurally let people disappear. https://en.m.wikipedia.org/wiki/Gulag Stalin had more people killed than Hitler. And to the Gulags can be added the people who tried to escape the Soviet Union and were shot down.