The Austrian psychiatrist Franz Niedermoser, a former chief physician of a city psychiatric hospital, and 12 of his subordinates found themselves in the dock. According to the Austrian prosecutor's office, using the Nazi practise of euthanasia of mentally disabled patients, the medical staff at the hospital killed about 250 to 400 people.
This case was one of several similar ones. The first euthanasia trial in the Third Reich was opened by a US military tribunal in October 1945, the so-called Hadamar trial. Hadamar was the name of a special psychiatric medical centre where patients were killed. The subject of the proceedings was an incident that occurred in the summer of 1944 when 476 Polish and Soviet workers suffering from tuberculosis were killed in Hadamar. However, the main victims of the killer doctors were German citizens: 15,000 Germans were euthanised there. On 14 March 1946, according to the sentence, three Hadamar trial defendants were executed and another four went to prison.
On 4 April 1946, the Austrian court sentenced Dr Niedermoser to death by hanging. He was executed on 24 October of the same year. Three nurses who directly committed the murders were executed as well. One of the accused doctors committed suicide on the day of the verdict. The rest of the doctors and nurses were punished by long-term imprisonment.
Source:
The newspaper "Pravda" from 22 March 1946