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Definition of agitator : 1. An implement for shaking or mixing.
2. One of a body of men appointed by the army, in Cromwell's time, to look after their interests; - called also adjutators.
3. One who agitates; one who stirs up or excites others; as, political reformers and agitators.

Synonyms:

malcontent, disrupter, freedom fighter, demagogue, demonstrator, boiler, dissident, propagandist, firebrand, converter, ringleader, change, rabble-rouser, rebel, convertor, calculator, troublemaker, counterrevolutionary, provocateur, agent, balance, conscientious objector, fomenter, heretic, fighter, activist, sans-culotte, ardent champion, blower, conservative, campaigner, calm, exciter, belt bomber, compressor, soapbox orator, radical, charger, reformer, politics, revisionist, revolutionary, zealous advocate, kindler, incendiary, exciter of public debate, dogmatist, inciter, fifth columnist, instigator, anarchist, active supporter, organizer, carriage, active partisan, stormy petrel

Usage examples:

• A Christian still came next to Hippias followed by a red agitator; Marcus had gained on the others and was now fourth. - "The Complete Historical Romances of Georg Ebers", Georg Ebers.
• The old gentleman did not know, of course, that on that very day the Italian Government was issuing its proclamation against the great agitator, and possibly if he had been aware of the incident it would not have produced any very strong impression upon his convictions. - "Sant' Ilario", F. Marion Crawford.
• " Eh, man Jock, listen to me," says the sleek, well fed agitator. - "Between You and Me", Sir Harry Lauder.