Mitläufer

A Mitläufer (German for "fellow traveller"; plural Mitläufer, feminine Mitläuferin) is a person tied to or passively sympathising with certain social movements, often to those that are prevalent, controversial or radical. In English, the term was most commonly used after World War II, during the denazification hearings in West Germany, to refer to people who were not charged with Nazi crimes but whose involvement with the Nazi Party was considered so significant that they could not be exonerated for the crimes of the Nazi regime.