An insurgent person trying to take control of a situation or organization by force or political maneuver. The term originated from the mostly young Turkish officers who overthrew Ottoman rulers after World War I.
A person, usually a young one, who threatens to overthrow an established system or order; an active rebel or reformer: He scrutinizes the new staff very carefully, and is dreadfully fearful of potential Young Turks
[1908+; originally, a member of Young Turkey, a revolutionary party of late 1800s Turkey, which finally established constitutional government in 1908]