Project Paperclip was one of several government projects after World War II whereby Nazi scientists, some associated with Holocaust atrocities, were brought to the U.S. to work and live. Other Nazis, like Klaus Barbie, "The Butcher of Lyon," were used by U.S. intelligence and helped to escape from Germany and later to avoid capture.
A memorandum prepared for the members of the Advisory Committee on Human Radiation Experiments [*] which discusses possible Project Paperclip and Nazi links to American radiation experiments.
Here is a web page at NameBase which lists books relating to Project Paperclip [*] along with a few interesting excerpts. The following excerpt is attributed to the book Blowback by Christopher Simpson: The CIA, the State Department, and U.S. Army intelligence each created special programs for the specific purpose of bringing selected former Nazis and collaborators to the United States.... The government employed these men and women for their expertise in propaganda and psychological warfare, for work in American laboratories, and even as special guerrilla troops for deployment inside the USSR in the midst of a nuclear war.... Hundreds, and perhaps thousands, of such recruits were SS veterans; some had been officers of the bloody Sicherheitsdienst (SD), the Nazi party's security service.These are remarks by Mark Weitzman before the Nazi War Criminals Interagency Working Group [*] at the web site of the National Archives and Records Administration.