Chelsea Elizabeth Manning is an American activist and whistleblower. She is a former United States Army soldier who was convicted by court-martial in July 2013 of violations of the Espionage Act and other offenses, after disclosing to WikiLeaks nearly 750,000 classified, or unclassified but sensitive, military and diplomatic documents. She was imprisoned from 2010 until 2017 when her sentence was commuted by President Barack Obama. A trans woman, Manning said in 2013 that she had a female gender identity since childhood and wanted to be known as Chelsea Manning.

Whistleblowing is the activity of a person, often an employee, revealing information about activity within a private or public organization that is deemed illegal, immoral, illicit, unsafe or fraudulent. Whistleblowers can use a variety of internal or external channels to communicate information or allegations. Over 83% of whistleblowers report internally to a supervisor, human resources, compliance, or a neutral third party within the company, hoping that the company will address and correct the issues. A whistleblower can also bring allegations to light by communicating with external entities, such as the media, government, or law enforcement. Some countries legislate as to what constitutes a protected disclosure, and the permissible methods of presenting a disclosure. Whistleblowing can occur in the private sector or the public sector.