退廃芸術
Posse had a checkered relationship with the National Socialists. His wife had joined the Nazi Party in 1932, but when Posse himself tried to join in 1933, his application was rejected a year later. He was later accused of having promoted so-called "Degenerate art", and of having Jewish ancestry. In 1938 he was asked to resign as director – a position he had held since 1910 from the age of 31 – but refused, taking a leave of absence instead. He was nevertheless fired, only to be restored to the position on Hitler's orders, possibly through the influence of Haberstock.