I've read the Edwin Black book - he makes a reasonably compelling but nearly completely circumstantial case.
The case against IBM could be made against any multinational of the era, like Ford and General Motors. The fact that IBM's business was information processing does not add or subtract to their level of supposed conspiracy.
From the time of declaration of war (against the US), all american companies were hands off - even before that the relationship between Dehomag and IBM NY became more and more distant from 1933 on.
Beyond that, the technology was not held by IBM alone, Powers/Remington-Rand and Siemens and Halkse also had similar equipment and technology - so while IBM may have been the market leader, they were by no means alone - and choosing IBM over Powers in my mind is different than buying a Ford-werke truck over an Opel one.
I haven't read the book, but I did read the EFF's brief (https://www.eff.org/document/eff-amicus-brief-ibm-ats-claim) which seems to rely a lot on the alleged Nazi connections. Based upon what I have read so far, there is no "smoking gun" that indicates IBM did anything to knowingly aid the Holocaust or Apartheid.
In the case of South Africa, it seems IBM aided in the creation of South Africa's national ID system. What I can't tell from the evidence presented is if this aid was illegal or unethical at the time it took place. As a reminder, the United States didn't officially outlaw segregation until the Civil Rights Act of 1964.
I really haven't made up my mind one way or another about this, but I do think people have a tendency to interpret historical events using the knowledge and ideology of the present day.
The case against IBM could be made against any multinational of the era, like Ford and General Motors. The fact that IBM's business was information processing does not add or subtract to their level of supposed conspiracy.
From the time of declaration of war (against the US), all american companies were hands off - even before that the relationship between Dehomag and IBM NY became more and more distant from 1933 on.
Beyond that, the technology was not held by IBM alone, Powers/Remington-Rand and Siemens and Halkse also had similar equipment and technology - so while IBM may have been the market leader, they were by no means alone - and choosing IBM over Powers in my mind is different than buying a Ford-werke truck over an Opel one.