The so called „T4 operation“, so titled for the street address of the office in charge, was the centrally organized „euthanasia“ of national socialist which brought death to more than 70.000 people. This operation was the first systematically planned and realised extermination against a week minority within the „Third Reich“. Mainly inmates and patients of asylums were murdered at six, especially for the purpose equipped hospital grounds, the so-called extermination sites. The people were killed by gas in newly constructed gas chambers. The T4 operation must be seen as a central part of the patient killing during the Nazi period which counted more than 300.000 victims and which was connected with the holocaust due to the fact that the physicians and nurses involved in the patient murder were taken as experts to concentration camps in Eastern Europe for their advise.
This publication presents the current state of research on the organisation of the T4 operation as well as the first results of a large-scale study focussing on the victims and their biographies.