Revenge is a harmful action against a person or group in response to a grievance, be it real or perceived. It is also called payback, retribution, retaliation or vengeance; it may be characterized as a form of justice (not to be confused with retributive justice), an altruistic action which enforces societal or moral justice aside from the legal system. Francis Bacon described it as a kind of "wild justice" that "does... offend the law [and] putteth the law out of office".