Quisling

A quisling (/ˈkwɪzlɪŋ/; Norwegian pronunciation: [ˈkʋɪsˈlɪŋ]) in Norwegian, English, and some other languages, is a person who collaborates with an enemy occupying force. The word originates from the Norwegian war-time leader Vidkun Quisling, who headed a domestic Nazi collaborationist regime during the Second World War. The word has remained current in various media since it originated through the early 21st century, although the related verb created by back-formation, quisle, has not.