Editing Action T4 (section)

== Extermination ==
Following the euthanasia order, Hitler established the Reich Committee for the Scientific Registering of Serious Hereditary and Congenital Illnesses, an office for registering disabled and mentally ill children as "defective", with Brandt, [[Ernst-Robert Grawitz]] and [[Viktor Brack]] at the helm. As a result of the euthanasia order, all children three or under who were suspected of suffering from Down syndrome, intellectual disability, blindness, deafness, microcephaly, hydrocephaly or what was referred to as "spastic conditions" were killed at [[concentration camp]]s and extermination centres through injections of phenol, with their deaths generally written off as pneumonia. The program was also used to target Jewish children, who were generally approved as eligible for euthanasia without any review as part of [[The Holocaust]].

During the course of Action T4, Bouhler, Brandt, Conti and [[Werner Heyde]] began plans to extend the killings to adults. Soon after the commencement of Action T4, the Nazi invasion of Poland occurred, and [[Reinhard Heydrich]], the man in charge of the invasion, collaborated with Action T4, ordering German ''[[Einsatzgruppen|Einsatzkommando]]'' units to murder disabled adult Poles, along with other ''untermenchsen'' they found. Mentally and physically disabled Polish adults were captured and taken to fake clinics, where they were either shot or killed in improvised [[Gas Chamber|gas chambers]]. Several gas chamber killings were witnessed by [[Heinrich Himmler]], providing the inspiration for their later use in the Holocaust. The killings later spread to other Nazi-occupied countries under the direction of men such as [[Erich Koch]], Grawitz, Brack and [[August Becker]].