Perón died on July 1, 1974. His wife succeeded him in office, but her administration was undermined by economic downfall (inflation was skyrocketing and GDP contracted), Peronist intra-party struggles, and growing acts of terrorism by insurgents such as the ERP and paramilitary movements. Montoneros, led by Mario Firmenich, cautiously decided to go underground after Peron's death. Isabel Perón was removed from office by the military coup on March 24, 1976. This gave way to the last and arguably most violent de facto government in Argentina, the National Reorganization Process.