Police informants

thumb|right|240px|A representative from the United States Department of State |U.S. State Department congratulates and offers a partial payment to a fully disguised informant whose information led to the neutralization of a terrorist in the Philippines thumb|Two-page totally confidential, direct and immediate letter from the Iranian Minister of Finance to the Minister of Foreign Affairs (Hossein Fatemi) about creating a foreign information network for controlling smuggling, 15 December 1952

German serial killer (1879–1925)

deceptive way to catch a person committing a crime

American outlaw biker (1938–2022)

American far-right activist leader of the Proud Boys

United States military, undercover operative (1924-1993)

American counterterrorism program

PIRA member; purported double agent

Canadian translator and scholar (1895–1977)

French anarchist, founder of European individualist anarchism (1848-1919)

German undercover agent (1941–2011)

American mobster