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pro·test·er [or] pro·test·or

protester [or] protestor

pro test r
part of speech: noun
definition 1: one who formally declares oneself against a policy, action, or decision.
Protesters of the bill expressed their disappointment.
definition 2: a person who makes a public display of objection to the action, decision, or policy of an institution or individual, esp. as a part of a group.
Protesters against the war marched down the main street.