Thursday, May 14, 2026

The Nazis’ Use of IBM During The Holocaust

Date:

IBM technology helped the Nazis carry out the Holocaust. But to what extent can we blame the tech giant?

A World War II-era IBM card sorting machine on display at the United States Holocaust Museum in Washington, D.C

It’s a disgrace to history to ignore the power that technology has in facilitating acts of evil — and IBM’s work with the Nazis serves as a prime example of that facilitation.

Beyond questions of morality, the Holocaust presented a number of logistical hurdles to the Nazis, and IBM offered them a perfectly legal solution. Indeed, during the mid-20th century, the software company’s punched-card technology helped the Nazis carry out the genocide of millions.

What Happened

First, it’s important to note that the Holocaust was at its core a highly organized and bureaucratic act, one planned to the T. Thus the Führer’s Final Solution would take place in six phases: identify those of Jewish descent; exclude them from society; confiscate their property; move them into ghettos; deport them, and exterminate them.

The first step toward achieving such a vision involved figuring out just how many people the Nazis needed to round up — in other words, conducting a census. Most advanced governments at the time used punched-card technology to do that, which is why IBM exists today.

IBM’s original incarnation was indeed born from the U.S. Census Bureau, which used a new electromechanical punched-card tabulator for its 1890 survey. This machine was the brainchild of 28-year-old American inventor Herman Hollerith, the son of a German immigrant. 

Hollerith formulated the idea by watching train conductors try to catch passengers reusing someone else’s ticket. The conductors would record characteristics like height or hair color by punching a ticket in a certain way, letting the next conductor to come along know if someone attempted to pull a fast one.

The young inventor combined that idea with a mechanized card reader whose physical springs would briefly cause an electrical connection when a punched hole appeared in a card. It was a rudimentary binary system that could sort and organize cards into piles, depending on which holes had been punched through.

Hollerith’s invention was a resounding success, and the machine reading industry was off to the races. Hollerith’s own company, Tabulating Machine Company, eventually consolidated with three others to form a new outfit that would soon call itself International Business Machines, IBM, in 1926 and hold a monopoly on this revolutionary punched-card system.

By the 1930s, the new Nazi government needed that technology — and recruited IBM for the job. Tabulating machines made tracking lines of Jewish descent possible, even if a German citizen’s family had married out of the religion or converted generations ago.

United States Holocaust Memorial Museum Collection, Gift of the Technische Sammlungen Dresden

The Nazis used the Dehomag D11 tabulator (left) and the Dehomag D11 sorter (right) to carry out the 1933 and 1939 censuses.

This transformed the way, scale and rate at which genocide could be waged. Of course, Adolf Hitler wasn’t the first political tyrant to engage in acts of genocide, but he was the first to do so with automation on his side. And with the demographic treasure trove collected in the 1933 census (and again in 1939), the Nazi government could work out who to target with more precision than ever.

By the time the Holocaust began in earnest in 1941, the Nazis tattooed concentration camp prisoners with identification numbers so that administrators could track that prisoner’s punch card throughout the system.

IBM’s machines were perfect for this, and for tracking the train traffic coming into the concentration camps. Indeed, the Nazis soon placed tabulating machines made by IBM’s German subsidiary, Dehomag, in every train depot and every concentration camp.

And throughout this entire era, IBM used foreign subsidiaries to funnel its international profits back to the U.S. Two of those subsidiaries — Dehomag and Poland’s Watson Business Machines — played a role in millions of deaths.

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IBM guidance computer hardware for the Saturn V Instrument Unit

In 1969, the United States of America alleged that IBM violated the Sherman Antitrust Act by monopolizing or attempting to monopolize the general-purpose electronic digital computer system market, specifically computers designed primarily for business, and subsequently alleged that IBM violated the antitrust laws in IBM’s actions directed against leasing companies and plug-compatible peripheral manufacturers. Shortly after, IBM unbundled its software and services in what many observers believed was a direct result of the lawsuit, creating a competitive market for software. In 1982, the Department of Justice dropped the case as “without merit”.

Also in 1969, IBM engineer Forrest Parry invented the magnetic stripe card that would become ubiquitous for credit/debit/ATM cards, driver’s licenses, rapid transit cards, and a multitude of other identity and access control applications. IBM pioneered the manufacture of these cards, and for most of the 1970s, the data processing systems and software for such applications ran exclusively on IBM computers. In 1974, IBM engineer George J. Laurer developed the Universal Product CodeIBM and the World Bank first introduced financial swaps to the public in 1981, when they entered into a swap agreement. The IBM PC, originally designated IBM 5150, was introduced in 1981, and it soon became an industry standard. In 1991 IBM spun out its printer manufacturing into a new business called Lexmark.

IBM and World War II

Both the United States and Nazi Germany used IBM punched card technology for some parts of their operations and record keeping.

By country

Germany

In Germany, during World War II, IBM engaged in business practices which have been the source of controversy. Much attention focuses on the role of IBM’s German subsidiary, known as Deutsche Hollerith Maschinen Gesellschaft, or Dehomag. Topics in this regard include:

  • documenting operations by Dehomag which allowed the Nazis to better organize their war effort, in particular the Holocaust and use of Nazi concentration camps;
  • comparing these efforts to operations by other IBM subsidiaries which aided other nations’ war efforts;
  • and ultimately, assessing the degree to which IBM should be held culpable for atrocities which were made possible by its actions.
  • the selection methods they developed and used had the purpose of selecting and killing civilians.

United States

In the United States, IBM was, at the request of the government, the subcontractor of the punched card project for the internment camps of Japanese Americans:

His grand design for 1943 was a locator file in which would appear a Hollerith alphabetic punch card for each evacuee. These cards were to include standard demographic information about age, sex, education, occupation, family size, medical history, criminal record, and RC location. However, additional data categories about links to Japan were also maintained, such as years of residence in Japan and the extent of education received there... The punch card project was so extensive and immediate that the War Relocation Authority subcontracted the function to IBM.

IBM equipment was used for cryptography by US Army and Navy organisations, Arlington Hall and OP-20-G and similar Allied organisations using Hollerith punched cards (Central Bureau and the Far East Combined Bureau).

The company developed and built the Automatic Sequence Controlled Calculator which was used to perform computations for the Manhattan project.

Source: ati, Wikipedia, Youtube, SlidePlayer

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