Janet is the secretary to the ceo. the ceo uses the corporate jet to travel to locations where he acts as a private consultant. janet knows that he does not disclose his consulting activities or the use of the corporate jet for personal gain, and she decides to make the ceo's activities public by alerting the board of directors. janet is a(n)

Janet is a  "whistleblower".

A whistleblower is a person, who could be a representative of an organization, or an administration office, unveiling data to people in general or some higher expert about any bad behavior, which could be as extortion, debasement, and so on.  

An whistleblower could be a representative, temporary worker, or a provider who winds up mindful of any unlawful exercises.  

To shield whistleblower from losing their activity or getting abused there are particular laws. Most organizations have a different arrangement which obviously states how to report such an occurrence.