On September 11, 1973, the democratically elected President Salvador Allende was overthrown by the Chilean armed forces and national police, bringing to power the regime of Augusto Pinochet that ruled until 1990. This followed an extended period of social and political unrest between the right-dominated Congress of Chile and Allende, as well as economic warfare waged by Washington. U.S. President Richard Nixon had promised to "make the economy scream" to "prevent Allende from coming to power or to unseat him". The regime of Pinochet is estimated to have disappeared around 3,200 political dissidents, imprisoned 30,000 (many of whom were tortured), and forced some 200,000 Chileans into exile. The CIA, through Project FUBELT (also known as Track II), worked secretly to engineer the conditions for the coup. Whilst the U.S. initially denied any involvement, many relevant documents have been declassified in the decades since.