private investigator
person who is not a government official who is hired to provide information about a person or group that is not widely available
Nazis hunter
private individual who tracks down and gathers information on alleged former Nazis, SS members, and Nazi collaborators who were involved in the Holocaust
store detective
plainclothes worker in retail loss prevention
private law investigator
professional investigator of private law
opposition researcher
political consultant who research potentially damaging information about their employer's opponent
claims adjuster
profession