whistleblower

Noun whistleblower has 1 sense

• whistleblower(n = noun.person) whistle-blower, whistle blower - 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"
is a kind of informant, source