whistle-blower

1. N-COUNT A whistle-blower is someone who finds out that the organization they work for is doing something immoral or illegal and tells the authorities or the public about it. 检举者; 告发者[journalism]

An FBI whistle-blower testified to Congress about problems in the agency. 一位联邦调查局的检举者就机构内的问题对国会作了证。