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Vidkun Quisling, a former Norwegian military officer and politician, was born on July 18, 1887. During World War II, he collaborated with the Nazis and established a pro-German puppet government in Norway, earning him a notorious reputation as a traitor. Quisling's name has become synonymous with betrayal and collaborationism, cementing his place in history as a cautionary figure against political alliances with oppressive regimes.