Comment by dredmorbius

Dutch (and other European) census data was used by Nazis in transacting the Holocaust. And IBM processed much realated concentration camp information.

https://en.wikipedia.org/wiki/History_of_the_Jews_in_the_Net...

https://en.wikipedia.org/wiki/Netherlands_in_World_War_II#Ho...

https://ibmandtheholocaust.com

Gerrit van der Veen, Willem Arondéus, Johan Brouwer, Rudi Bloemgarten. specifically destroyed municipal records in a moonumental act of defiance to the Nazis:

https://medium.com/@hansdezwart/during-world-war-ii-we-did-h...