Definition of "quisling"

In many countries, including some where the Jews were neither numerically strong nor in possession of important posts, these envoys of the German Secret Service have been able, solely by the use of anti-Jewish slogans, to create those "national" Fascist movements from which Quislings are bred.

1940, Walter Tschuppik, The Quislings: Hitler's Trojan Horses, Hutchinson, page 7

If, in the nation about to be attacked, influential persons were discovered who could be bribed or corrupted, German agents made use of these quislings.

1944, Ralph D. Casey, EM 2: What Is Propaganda?‎, War Department

The man she cherishes, the man she butterfly-kisses, the man she sleeps curved around like two spoons in a drawer. It is he who is evil, he who is sworn to destroy her, an emotional quisling of the first water.

1993, Will Self, My Idea of Fun