"The 1933 census, with design help and tabulation services provided by IBM through its German subsidiary, proved to be pivotal to the Nazis in their efforts to identify, isolate, and ultimately destroy the country's Jewish minority. Machine-tabulated census data greatly expanded the estimated number of Jews in Germany by identifying individuals with only one or a few Jewish ancestors. Previous estimates of 400,000 to 600,000 were abandoned for a new estimate of 2 million Jews in the nation of 65 million.[15]"
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And in the first world: https://en.wikipedia.org/wiki/IBM_and_the_Holocaust
"The 1933 census, with design help and tabulation services provided by IBM through its German subsidiary, proved to be pivotal to the Nazis in their efforts to identify, isolate, and ultimately destroy the country's Jewish minority. Machine-tabulated census data greatly expanded the estimated number of Jews in Germany by identifying individuals with only one or a few Jewish ancestors. Previous estimates of 400,000 to 600,000 were abandoned for a new estimate of 2 million Jews in the nation of 65 million.[15]"