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Denunciation (from Latin denuntiare, to denounce) is an open public accusation or reporting a person or a group of persons to public authorities, often done anonymously for low political or personal motives, on which the informant has a personal interest or hopes to gain personal benefits.
A person who denounces can be called denouncer, informer, informant or by various legal and slang terms, such as snitch.
References
Denunciation Wikipedia(Text) CC BY-SA