George Bushs administration claims it is waging a war against terrorism. But since April 2005 Luis Posada Carriles, who worked for the CIA and engaged in brutal terrorist acts including the bombing of a Cuban airliner, has resided in the US, and Washington has resisted pressure to deport him to Venezuela, where he escaped from jail, to face justice. Posada Carriles is currently in immigration detention for entering the US illegally. Even a court filing by the US Justice Department described him as the admitted mastermind of terrorist plots and attacks. The following letter, among the signatories of which are four Nobel laureates, was issued on October 6.