A rabble-rouser is someone who incites a crowd of people into action, most often violent action. A rabble-rouser usually attempts to stir up the emotions of the masses for political reasons.

What do you think rabble rousers are?

a person who stirs up the passions or prejudices of the public, usually for his or her own interests; demagogue.

What does rabble rouser mean in English?

: one that stirs up the masses of the people (as to hatred or violence) : demagogue.