Soviet census revealed nearly 30 million missing people by 1937.

Evidence

The following information reported by Souvarine, op. cit., p. 669, seems to be an outstanding illustration: “According to W. Krivitsky, whose excellent confidential source of information is the GPU: ‘Instead of the 171 million inhabitants calculated for 1937, only 145 million were found; thus nearly 30 million people in the USSR are missing.”’ And this, it should be kept in mind, occurred after the dekulakization of the early thirties which had cost an estimated 8 million human lives. — Hannah Arendt, The Origins of Totalitarianism, 2554