I would not worry about those Nazis who fled to South America, the really bad guys were caught and the rest are likely dead. Now in the 21st century, it's assumed that most of the top officials who evaded justice have died one way or another. After all, a man who was 35 in 1940 would be 105 years old by 2010.
Ratlines were systems of escape routes for Nazis and other fascists fleeing Europe at the end of World War II. These escape routes mainly led toward havens in South America, particularly Argentina, Paraguay, Brazil, and Chile. Other destinations included the United States and perhaps Canada and the Middle East. There were two primary routes: the first went from Germany to Spain, then Argentina; the second from Germany to Rome to Genoa, then South America; the two routes "developed independently" but eventually came together to collaborate Adolf Eichmann's wife and two children arrived in Argentina in mid-1952. In the autumn of 1957 Walter Eytan at the Israeli Foreign Ministry, got a call from Fritz Bauer, the public prosecutor of the province of Hesse, Germany. Hesse told Eytan that Eichmann was alive and living in Argentina. But a special operations Mossad team captured and smuggled him out. Adolf Eichmann stood trial before an Israeli court in 1961, was found guilty and hanged in 1962. Argentina had lax immigration procedures and an administration led by Juan Perón.
Note: You have to love the Israis
Klaus Barbie, "The Butcher of Lyon," who is said to have enjoyed physically torturing prisoners, including children, was captured in Bolivia in 1983. Barbie, who had worked as an agent for the British and then the Americans following World War II, was found guilty and sentenced to life in prison, where he died in 1991 [source: Jewish Virtual Library].
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