By mid-1944, the Nazis had Hollerith Departments (Hollerith Abteilung) "installed at the main concentration camps at Mauthausen, Ravensbrüch, Flossenbürg and Buchenwald." The SS Hollerith cards included codes for the grounds for confinement (Jehovah's Witness=01, homosexuals=02, Jews=05), birth date, gender, ethnicity (Reich German=0, Ethnic German=1, Foreigner=2), labor capacity, occupation, and reason for departure (execution=3, escape=4, special treatment=6). These IBM Hollerith numbers would be tattooed on the arms of people entering Auschwitz
All of this information was sorted and tabulated to make the administration of the massive camp system possible. Dachau alone was using 24 IBM machines by the end of the war. These machines were, in many ways, both the origin of the "surveillance society" and an example of everyone's fears about what happens when powerful authoritarians have too much access to too much information about us.
Of course, in the Brave New Labour World, national ID registers, centralised medical records, child surveillance systems and countless other databases could never be abused in this way.