After Germany’s surrender, Heidegger faced an immediate teaching ban imposed by French occupiers.

Evidence

Meanwhile, the little band of university refugees — around ten professors and thirty students, mostly women — had cycled through the Black Forest, with Heidegger himself catching them up later on his son’s bicycle. He stayed with the princess and her husband at a nearby forester’s lodge which they used as their home, while the rest of the group ascended into the fairy-tale castle. Through May and June 1945, even after the French had arrived in the area, the philosophers helped to bring in hay from surrounding fields, and spent the evenings entertaining each other with lectures and piano recitals. At the end of June, they had their farewell party in the forester’s lodge; Heidegger lectured them on Hölderlin. When the pleasant few months came to an end, the merry band returned home to Freiburg, no doubt ruddy-cheeked and fit. But Heidegger arrived in Freiburg to find his home full of strangers, the city under French administration, and a total ban against him teaching. — Sarah Bakewell, At the Existentialist Café, 564