I read this book regarding Dehomag and quiet control of it through Switzerland by IBM corporate offices in Armonk, NY.

IBM had much more influence over the German subsidiary than you think.

'David Cesarani of Southampton University stated that Black provided "shocking evidence" that IBM in America continued to provide punch cards and other services to the Nazis "in defiance of Allied regulations against trading with the enemy."'

https://en.m.wikipedia.org/wiki/IBM_and_the_Holocaust

This is a famous photo of Thomas J. Watson (CEO of IBM) meeting with Adolf Hitler:

https://www.computerhistory.org/revolution/punched-cards/2/1...](