Leader of Argentina's Mothers of Plaza de Mayo group Hebe de Bonafini stand on a stage, in Buenos Aires, Monday, April 30, 2007, during an act to mark the 30th anniversary of their first protest to demand the return of their disappeared relatives. Nearly 13,000 people are officially listed as dead or missing from the so-called dirty war in which the state carried out illegal detentions, torture and executions of political opponents. Human rights groups say the toll is higher. (AP Photo/Natacha Pisarenko)