The Nazis used the census to find Jews. A huge amount of people had no idea that they had matrilineal Jewish descent until the Nazis and IBM told them. https:/

The Nazis used the census to find Jews. A huge amount of people had no idea that they had matrilineal Jewish descent until the Nazis and IBM told them. https://en.wikipedia.org/wiki/IBM_and_the_Holocaust https://en.wikipedia.org/wiki/IBM_and_the_Holocaust