Only after Jews were identified -- a massive and complex task that Hitler wanted done immediately -- could they be targeted for efficient asset confiscation, ghettoization, deportation, enslaved labor, and, ultimately, annihilation. It was a cross-tabulation and organizational challenge so monumental, it called for a computer. Of course, in the 1930s no computer existed.

But IBM's Hollerith punch card technology did exist. Aided by the company's custom-designed and constantly updated Hollerith systems, Hitler was able to automate his persecution of the Jews. Historians have always been amazed at the speed and accuracy with which the Nazis were able to identify and locate European Jewry. Until now, the pieces of this puzzle have never been fully assembled. The fact is, IBM technology was used to organize nearly everything in Germany and then Nazi Europe, from the identification of the Jews in censuses, registrations, and ancestral tracing programs to the running of railroads and organizing of concentration camp slave labor.

IBM and its German subsidiary custom-designed complex solutions, one by one, anticipating the Reich's needs. They did not merely sell the machines and walk away. Instead, IBM leased these machines for high fees and became the sole source of the billions of punch cards Hitler needed.

IBM and the Holocaust takes you through the carefully crafted corporate collusion with the Third Reich, as well as the structured deniability of oral agreements, undated letters, and the Geneva intermediaries -- all undertaken as the newspapers blazed with accounts of persecution and destruction.

Just as compelling is the human drama of one of our century's greatest minds, IBM founder Thomas Watson, who cooperated with the Nazis for the sake of profit.

Only with IBM's technologic assistance was Hitler able to achieve the staggering numbers of the Holocaust. Edwin Black has now uncovered one of the last great mysteries of Germany's war against the Jews -- how did Hitler get the names?