Questionnaires were then distributed to mental institutions, hospitals and other institutions caring for the chronically ill.
Patients had to be reported if they suffered from schizophrenia, epilepsy, senile disorders, therapy resistant paralysis and syphilitic diseases, retardation, encephalitis, Huntington's chorea and other neurological conditions, also those who had been continuously in institutions for at least 5 years, or were criminally insane, or did not posses German citizenship or were not of German or related blood, including Jews, Negroes, and Gypsies.
A total of six killing centers were established including the well known psychiatric clinic at Hadamar. An SS man named Christian Wirth, a notorious brute with the nickname ‘the savage Christian’, eventually headed the euthanasia program.
At Brandenburg, a former prison was converted into a killing center where the first Nazi experimental gassings took place. The gas chambers were disguised as shower rooms, but were actually hermetically sealed chambers connected by pipes to cylinders of carbon monoxide. Patients were generally drugged before being led naked into the gas chamber. Each killing center included a crematorium where the bodies were taken for disposal. Families were then falsely told the cause of death was medical such as heart failure or pneumonia.
But the huge increase in the death rate for the disabled combined with the very obvious plumes of odorous smoke over the killing centers aroused suspicion and fear. At Hadamar, for example, local children even taunted arriving busloads of patients by saying "here comes some more to be gassed."
