About the humiliations to which Hausdorff and his family especially were exposed to after Kristallnacht in 1938, much is known and from many different sources, such as from the letters of Bessel-Hagen.
Über die Demütigungen, denen Hausdorff und seine Familie insbesondere nach den Novemberpogromen 1938 ausgesetzt waren, weiß man einiges aus verschiedenen Quellen, z. B. aus den Briefen von Bessel-Hagen.