In the 70 years since World War II and the postwar trials that followed at Nuremberg, many former Nazis continued to escape prosecution for their role in the murder of some 6 million Jews, among other wartime atrocities. Many of them fled Europe for the United States, Canada and South America, where they assumed new identities. Some high-profile Nazi leaders, such as Adolf Eichmann, were tracked down and prosecuted, while others (including the infamous doctor Josef Mengele) evaded the law and died free men. As history marches on, and the pool of still-living former Nazis continues to shrink, the search for justice has become a race against time. Take a look at some of the “most wanted” Nazis who have been forced to face charges for their crimes in recent years, some who died before they could do so and some who still remain at large.