Answer :
Due to lack of context, but the fact that your question is marked under history, I'm going to assume that you're referring to the historical term of "whistleblower" and I will be answering based off of my knowledge of that.
Answer:
Whistleblowing signifies the wrongdoings has occurred within an organization.
Explanation:
Whistle blowing means calling attention to wrongdoing that is occurring within an organization. The Government Accountability Project lists four ways to blow the whistle:
Reporting wrongdoing or a violation of the law to the proper authorities (Such as a supervisor, a hotline or an Inspector General)
Refusing to participate in workplace wrongdoing
Testifying in a legal proceeding
Leaking evidence of wrongdoing to the media
hope this helps!!:)