His name is now a term that means traitor. That’s because after two decades of working for the Norwegian government in various roles, he collaborated with Hitler and the Nazi party, welcomed the German occupation of his country.
Research:

Gustave Flaubert and the ‘Madame Bovary’ Trial
45:15

Elizabeth Bisland, Beyond the Trip Around the World
42:54

SYMHC Classics: Marie Laurencin
32:46