instigator

a person who stirs up public feelings especially of discontent an instigator who always managed to be innocently standing by once the fighting began Synonyms demagogue (also demagog), exciter, firebrand, fomenter, incendiary, inciter, agitator, kindler, provocateur, rabble-rouserRelated Words demonstrator, marcher, objector, picketer, protester (or protestor); advocate, apostle, backer, booster, champion, exponent, persuader, promoter, proponent, reformer, reformist, supporter; alarmist, extremist, insurgent, insurrectionist, radical, rebel, revolter, revolutionary, revolutionist, subversive, troublemaker; goader, prodder, prompter, provoker; agent provocateurNear Antonyms peacemaker, reconciler, uniter