A trove of recently declassified documents leads to several inescapable conclusions about the FBI’s role in protecting both proven and alleged Nazi war criminals in America. First, there can be no doubt that J. Edgar Hoover collected Nazis and Nazi collaborators like pennies from heaven. Unlike the military and its highly structured Operation Paperclip — with its specific targets, systematic falsification of visa applications, and creation of bogus biographies — Hoover had no organized program to find, vet, and recruit alleged Nazis and Nazi collaborators as confidential sources, informants, and unofficial spies in émigré communities around the country. America’s No. 1 crime buster was guided only by opportunism and moral indifference.