Answer
Kurt Waldheim, the former Secretary-General of the United Nations, was embroiled in a controversy surrounding his Nazi past in 1986. Wiesenthal, a renowned Nazi hunter, played a crucial role in revealing Waldheim's involvement with a Nazi paramilitary organization during World War II. The scandal tarnished Waldheim's reputation and sparked international outrage, leading to intense scrutiny of his wartime activities and challenging the perception of his neutrality as a diplomat.