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Adolf Hitler's authorization for the Euthanasia Program (Operation T4), signed in October 1939 but dated September 1, 1939.
![Adolf Hitler's authorization for the Euthanasia Program (Operation T4), signed in October 1939 but dated September 1, 1939. [LCID: 67072]](https://encyclopedia.ushmm.org/images/large/b03cd0c7-c662-498e-a086-443cf2189d2b.jpg)
![Smoke rising from the chimney at Hadamar, one of six facilities which carried out the Nazis' Euthanasia Program. [LCID: 86721a]](https://encyclopedia.ushmm.org/images/thumb/579c2a80-2adf-4fdb-937b-59f0d5f5b33e.jpg)