agitator

agitator [ag = to do 做; -it- 连接音; -at(e) = v. to make or cause 使...的; -or = n. people or things that do something 做…的人；用于…的物 ]

• agitator noun [C]
  someone who tries to make people take part in protests and political activities, especially ones that cause trouble(抗议或政治波动中的)煽动者，策动者