"In the late 1940s, Walther (Walter) Rauff, an SS officer who was responsible for the murder of at least 100,000 people and was wanted by the Allies as a war criminal, was employed by the Israeli secret service. Instead of bringing him to justice it paid him for his services and helped him escape to South America. Documents of the U.S. Central Intelligence Agency (CIA) that have been released over the past several years show that the Americans were aware that Rauff's case was not exceptional." (thanks Yusuf)