Nazi hunter

A Nazi hunter is an individual who tracks down and gathers information on alleged former Nazis, or SS members, and Nazi collaborators who were involved in the Holocaust, typically for use at trial on charges of war crimes and crimes against humanity. Prominent Nazi hunters include Simon Wiesenthal, Tuviah Friedman, Serge Klarsfeld, Beate Klarsfeld, Ian Sayer, Yaron Svoray, Elliot Welles, and Efraim Zuroff.