 However, the judgement was set aside in a subsequent, unprecedented case on the basis that one of the judges involved was potentially biased due to his ties to Amnesty International, a human rights organization that had campaigned against Pinochet for decades and acted as an intervenor in the case.A third ruling in March 1999 confirmed the original verdict; this time, the Lords held that Pinochet could only be prosecuted for crimes committed after 1988, the year in which the United Kingdom implemented legislation ratifying the United Nations Convention Against Torture in the Criminal Justice Act 1988.This invalidated most, but not all, of the charges against Pinochet and gave the green light for his extradition to Spain to proceed.