Since the end of National Reorganization Process and the Dirty War, when guerrilla groups (mainly left-wing Peronist "Montoneros" and the Trotskyist "Ejército Revolucionario del Pueblo" or "ERP") were persecuted by the armed forces (together with law enforcement agencies and paramilitary groups), this term has been in wide use by people mainly in human rights movements, the political left, and former guerrilla members and supporters. These people argue that a national state, even one controlled by a "de facto" government, cannot be compared to a guerrilla or other subversive group, the difference being precisely that the institutions of a national state are supposed to act within the confines of law, even when using violence to fight outlaws.