Keywords: Karl-Bonhoeffer-Nervenklinik History ; Aktion T4 (Germany) ; Psychiatric hospital care History 20th century ; Psychotherapists Professional ethics 20th century ; History ; National socialism Moral and ethical aspects ; Euthanasia History 20th century ; World War, 1939-1945 Atrocities ; Psychotherapy History 20th century ; Karl-Bonhoeffer-Nervenklinik History ; National socialism Moral and ethical aspects ; Euthanasia Germany ; Berlin ; History ; 20th century ; Psychiatric hospital care Germany ; Berlin ; History ; 20th century ; Aktion T4 (Germany) ; Wittenau (Berlin, Germany) History ; World War, 1939-1945 Atrocities ; Hospitals, Psychiatric history ; National Socialism history ; Berlin ; Hospitals, psychiatric ; History ; Wittenau (Berlin, Germany) History ; Aufsatzsammlung ; Berlin ; Euthanasie ; Geschichte 1933-1945 ; Drittes Reich ; Euthanasie ; Psychiatrie ; Bonhoeffer, Karl 1868-1948 ; Rassenhygiene ; Bonhoeffer, Karl 1868-1948