Vidkun Quisling-how his name entered history

"Vidkun Quisling (1887-1945) served as the prime minister of Norway during the German occupation, from 1940 to 1945. He collaborated with the Nazis and was responsible for the persecution of Norwegian Jews. Found guilty of high treason, Quisling was executed in 1945. His name entered the English language as a synonym for traitor."