And how do you know that?
Indeed he was a Nazi, but we have no idea what he knew or suspected was going on. I doubt that very few did, it’s not like they broadcasted their intentions. That’s how Hitler got by with his secretive genocide.
Weisenthal, the great Nazi hunter, was an Austrian holocaust survivor himself and had carte blanche access to the Austrian files, journals, photographs. They take pride in their recording keeping, just like the Germans.
I’m sure they would have charged and convicted Waldheim if there was a scrap of evidence that he committed a war crime. It would have been one of the biggest successes of the tribunal.
FWIW, The New York Times tried to smear / convict Waldheim to kill his political career, but they got nowhere.
Service in Yugoslavia and Greece
Waldheim’s functions within the staff of German Army Group E from 1942 until 1945, as determined by the International Commission of Historians,[5] were:
Interpreter and liaison officer with the 5th Alpine Division (Italy) in April/May 1942, then,
O2 officer (communications) with Kampfgruppe West in Bosnia in June/August 1942,
Interpreter with the liaison staff attached to the Italian 9th Army in Tirana in early summer 1942,
O1 officer in the German liaison staff with the Italian 11th Army and in the staff of the Army Group South in Greece in July/October 1943, and
O3 officer on the staff of Army Group E in Arksali, Kosovska Mitrovica and Sarajevo from October 1943 to January/February 1945.
By 1943, Waldheim was serving in the capacity of an aide-de-camp in Army Group E which was headed by General Alexander Löhr.[6] In 1986, Waldheim said that he had served only as an interpreter and a clerk and had no knowledge either of reprisals against local Serb civilians or of massacres in neighboring provinces of Yugoslavia. He said that he had known about some of the things that had happened, and had been horrified, but could not see what else he could have done.[4]
Much historical interest has centered on Waldheim’s role in Operation Kozara in 1942.[7] According to one post-war investigator, prisoners were routinely shot within only a few hundred meters (yards) of Waldheim’s office,[8] and just 35 kilometres (22 mi) away at the Jasenovac concentration camp. Waldheim later stated that “he did not know about the murder of civilians there”.[8]
Waldheim’s name appears on the Wehrmacht’s “honor list” of those responsible for the militarily successful operation. The Nazi puppet state, the Independent State of Croatia, awarded Waldheim the Medal of the Crown of King Zvonimir in silver with an oak branches cluster.[9] Decades later, during the lobbying for his election as U.N. Secretary General, Yugoslav President Josip Broz Tito, who had led anti-German forces during the war, awarded Waldheim one of the highest Yugoslav orders.[10]
Waldheim denied that he knew war crimes were taking place in Bosnia at the height of the battles between the Nazis and Tito’s partisans in 1943.[11] According to Eli Rosenbaum, in 1944, Waldheim reviewed and approved a packet of anti-Semitic propaganda leaflets to be dropped behind Soviet lines, one of which ended: “Enough of the Jewish war, kill the Jews, come over.”[12]
Source: Wikipedia
You know damn well the reason they didn’t go after Waldheim, was because it would have made the UN look bad, if it came out their former Secretary General committed War Crimes.