Vidkun Quisling was a Norwegian politician and military officer who is best known for his collaboration with Nazi Germany during World War II. He led a pro-German government in Norway after the country was invaded in 1940. His actions made him a symbol of treachery, and the term "quisling" has since become synonymous with betrayal. After the war, Quisling was arrested, tried, and executed for his crimes against Norway and its people. His collaboration with the Nazis and the establishment of a puppet government led to widespread suffering and oppression in Norway, marking him as one of history's most infamous traitors.