How do you think the systematic mass-murder on an industrial scale started?
In 1939, some camps where already there, people already rounded up - but the 'efficient' mass-murder had not started yet.
In the spring of 1939, even before the start of #WW2, people from the highest circle started planning. Led by Philipp Bouhler (director of Hitler's private chancellery) and Karl Brandt (Hitler's attending physician).
They planned to murder all 'disabled' children (& later adults) - #AktionT4
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