agitator
US /ˈædʒ.ə.teɪ.t̬ɚ/
UK /ˈædʒ.ə.teɪ.t̬ɚ/

1.
a person who urges others to protest or rebel
:
•
The political agitator was arrested for inciting a riot.
•
He was known as a tireless agitator for workers' rights.
a person who urges others to protest or rebel