A person who secretly disrupts a group's activities from within the group; an instigator, troublemaker
person hired to incite a group to do something illegal which will result in their being punished
An agent provocateur is a person who is employed by the government or the police to encourage certain groups of people to break the law, so they can arrest them or make them lose public support. Agents provocateurs may seek to discredit the opposition. agents provocateurs someone who is employed to encourage people who are working against a government to do something illegal so that they are caught