Additional allegations of participation in Nazi crimes, with citations to captured Nazi documents and other records, were leveled in a 1993 book by Eli Rosenbaum, the former U.S. federal prosecutor who had directed the World Jewish Congress investigation that led to the New York Times' initial exposure of Waldheim's hidden Nazi-era past in 1986. The book also alleged that the Soviet Union was aware of Waldheim's alleged involvement in Nazi crimes and that, after vetoing other candidates in order to get Waldheim installed as U.N. Secretary General in 1972, used that information to extract concessions at the United Nations that facilitated KGB espionage in the United States, and that the CIA's failure to anticipate this possibility was a major failure for the intelligence agency.[52] In a letter to the editor published in Foreign Affairs magazine two years after Rosenbaum's book was released, former Finnish ambassador to the U.N. Max Jakobson (one of the candidates whom the USSR had vetoed) wrote, "The Soviets knew everything about Waldheim. That is why they preferred him."
Additional allegations of participation in Nazi crimes, with citations to captured Nazi documents and other records, were leveled in a 1993 book by Eli Rosenbaum, the former U.S. federal prosecutor who had directed the World Jewish Congress investigation that led to the New York Times' initial exposure of Waldheim's hidden Nazi-era past in 1986. The book also alleged that the Soviet Union was aware of Waldheim's alleged involvement in Nazi crimes and that, after vetoing other candidates in order to get Waldheim installed as U.N. Secretary General in 1972, used that information to extract concessions at the United Nations that facilitated KGB espionage in the United States, and that the CIA's failure to anticipate this possibility was a major failure for the intelligence agency.[52] In a letter to the editor published in Foreign Affairs magazine two years after Rosenbaum's book was released, former Finnish ambassador to the U.N. Max Jakobson (one of the candidates whom the USSR had vetoed) wrote, "The Soviets knew everything about Waldheim. That is why they preferred him."
https://en.wikipedia.org/wiki/Kurt_Waldheim#Allegations_of_war_crimes