Bücherverbrennung 1933 in Deutschland
Mackay died in Stahnsdorf on 16 May 1933, ten days after the Nazi book burnings at the Institut für Sexualwissenschaft. Adolf Hitler had become Reichskanzler on 30 January 1933, and soon all activities of the German homosexual emancipation movement ceased. Allegations that Mackay's death may have been a suicide have been disputed: