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The Kurt Waldheim scandal erupted in 1986, centering around the revelations of United Nations Secretary-General Kurt Waldheim's Nazi past during World War II. Wiesenthal played a crucial role in exposing Waldheim's wartime activities, including his potential involvement in war crimes and deportations. Wiesenthal's efforts garnered international attention and significantly influenced the outcome of the Austrian presidential election, ultimately leading to Waldheim's defeat.