Hatt became a public figure in the late 1930s through the early 1940s with his geopolitical analyses that communicated through radio, newspaper, books and journal articles. During the World War II German occupation of Denmark, Hatt joined the Danish-German reconciliation, possibly because he saw Germany as a natural and inevitable bulwark against Russian communism. After Denmark's liberation, Hatt was brought before an official court, was found to be engaged in ‘dishonourable national conduct’ during the German occupation, and was dismissed from his university chair, albeit with full pension. He became professionally more isolated, however, Hatt continued to publish more of his work in archeology. His last research was on the Danish Iron Age settlement in Fjand.
