Synonyms of whistleblower

Noun

1. whistle blower, whistle-blower, whistleblower, informant, source

usage: an informant who exposes wrongdoing within an organization in the hope of stopping it; "the law gives little protection to whistleblowers who feel the public has a right to know what is going on"; "the whistleblower was fired for exposing the conditions in mental hospitals"

Definition and meaning of whistleblower (Dictionary)