agent provocateur

Definitions

Law

  • noun a person who provokes others to commit a crime, often by taking part in it personally, in order to find out who is not reliable or in order to have his or her victim arrested

Military

  • noun French words meaning ‘agent who provokes’: a person who provokes others to start civil disorder or to commit a crime (often by taking part himself) in order to start a revolution, or to find out who is not reliable, or to encourage people to commit crimes for which they will be arrested

Politics

  • French words meaning ‘an agent who provokes’: a person employed secretly by a government who provokes others to commit a crime, often by taking part in it personally, in order to find out who is not reliable or in order to have his or her associates arrested
http://www.dictionarycentral.com/definition/agent-provocateur.html