Answer: whistle-blowing
Explanation: Whistle blowing refers to the fact of immediately reporting unethical or secretive act that is committed within an organization
This suspected or spotted unethical act may be violation of company law or regulation, threat to the public interest ,fraud or corruption.
A whistle-blower(someone who reveals this secretive act) may do this by using internal measures or external means , internally like Philippa did by telling the manager. Externally may be thing like contacting the media depending on the act commited.