denouncer

noun denouncer

• accuser — An accuser is a person who says that another person has done something wrong, especially that he or she has committed a crime.
• censurer — strong or vehement expression of disapproval: The newspapers were unanimous in their censure of the tax proposal.
• condemner — to express an unfavorable or adverse judgment on; indicate strong disapproval of; censure.
• condemnor — a government or private party with the power to acquire private property for public use
• criticizer — to censure or find fault with.