noun
reporter; informer; whistleblower
Refers to a person who reports an incident or wrongdoing to authorities, such as the police. Can be neutral or positive in the context of whistleblowing, but may carry a negative connotation of 'informer' depending on context.
事件の通報者は匿名を希望した。
The person who reported the incident wished to remain anonymous.
内部通報者を保護する法律が
There are laws to protect whistleblowers.
内部告発者 specifically refers to an insider whistleblower exposing organizational wrongdoing, whereas 通報者 can be any reporter, including external witnesses.
Compound of 通報 (つうほう, 'report, notification') + 者 (しゃ, 'person').