whistle-blower

Etymology
, referring to a police officer blowing their whistle on observing a violation of the law.

Noun

 * 1)  One who reports a problem or violation to the authorities; especially, an employee or former employee who reports a violation by an employer.

Translations

 * Armenian:
 * Bashkir: ошаҡсы
 * Chinese:
 * Mandarin:, 舉報人, 告發者, 檢舉者
 * Czech: informátor
 * Danish: whistleblower
 * Dutch:
 * Finnish:
 * French:, , ,
 * Galician: malsín, chileta, lengoreteiro
 * Georgian: ინფორმატორი, დამსმენი, მომხსენებელი
 * German:, , , Enthüller, Skandalaufdecker
 * Hungarian:
 * Icelandic: uppljóstrari
 * Indonesian: pengungkap aib
 * Irish: sceithire
 * Italian:
 * Japanese: 内部告発者
 * Korean: 내부고발자
 * Macedonian: свиркач
 * Norwegian: fløyteblåser,
 * Polish:
 * Portuguese:
 * Russian:, , , ,
 * Serbo-Croatian:
 * Cyrillic: звиждач
 * Roman:
 * Spanish: revelador de secretos, en su trabajo, alertador, denunciante
 * Swedish:
 * Turkish:
 * Ukrainian: інформа́тор, інформа́торка
 * Vietnamese: người thổi còi, người tố cáo, người tố giác