Protester

n.	1.	One who protests; one who utters a solemn declaration.
	2.	(Law) One who protests a bill of exchange, or note.

Noun	1.	protester - a person who dissents from some established policy Synonyms: dissenter, dissident, objector, contestant
	2.	protester - someone who participates in a public display of group feeling Synonyms: demonstrator

apostate, bitter-ender, brawler, defendant, demurrer, diehard, disputant, dissenter, dissentient, dissident, intransigent, irreconcilable, last-ditcher, litigant, naysayer, negativist, nonconformist, noncooperator, objector, obstructionist, obstructive, opinionist, opposer, opposition voice, oppositionist, plaintiff, protestant, quarreler, recusant, resister, schismatic, scrapper, sectarian, sectary, separatist, wrangler