Aktion T4 was a postwar name for mass murder through involuntary euthanasia in Nazi Germany. …

In October 1939 Adolf Hitler signed a “euthanasia note” backdated to 1 September 1939, that authorized his physician Karl Brandt and Reichsleiter Philipp Bouhler to implement the programme.

The killings took place from September 1939 until the end of the war in 1945 …

In the towns where the killing centres were located, many people saw the inmates arrive in buses, saw the smoke from the crematoria chimneys and noticed that the buses were returning empty. In Hadamar, ashes containing human hair rained down on the town. …

Memorial in Berlin to the disabled killed by Nazis in Germany.