Keywords: Aktion T4 (Germany) ; Karl-Bonhoeffer-Nervenklinik ; Karl-Bonhoeffer-Nervenklinik History ; Wittenauer Heilstätten ; Geschichte 1900-2000 ; Geschichte 1933-1945 ; Ethik ; Geschichte ; Psychotherapie ; Weltkrieg (1939-1945) ; Euthanasia History 20th century ; Hospitals, Psychiatric history ; National socialism Moral and ethical aspects ; Political Systems ; Psychiatric hospital care History 20th century ; Psychotherapists Professional ethics 20th century ; History ; Psychotherapy History 20th century ; World War, 1939-1945 Atrocities ; Psychiatrie ; Geistig behinderter Mensch ; Germany ; Wittenau (Berlin, Germany) History ; Aufsatzsammlung ; Wittenauer Heilstätten ; Geschichte 1933-1945 ; Geistig behinderter Mensch ; Psychiatrie ; Geschichte 1933-1945