“The death of one man is a just death, the death of two millions is a statistic.”

Aber das ist wohl so, weil ein einzelner immer der Tod ist — und zwei Millionen immer nur eine Statistik.
Der schwarze Obelisk (1956)
A variant of this quote "One death is a tragedy. A million deaths is just a statistic." has also been attributed to Joseph Stalin, but no source for this has been found. This version appeared in the English press not later than 1958. (Ремарк, Эрих Мария // Словарь современных цитат / составитель К. В. Душенко — Москва: изд-во «Эксмо», 2006)