 At the same time, the KGB made creative use of assassination to deal with high-profile defectors such as Georgi Markov, and Israel's Mossad made use of such tactics to eliminate Palestinian guerrillas, politicians and revolutionaries, though some Israelis argue that the targeted often crossed the line between one or another or were even all three.Most major powers were not long in repudiating such tactics, for example during the presidency of Gerald Ford in the United States in 1976 (Executive Order 12333, which proscription was relaxed however by the George W. Bush administration).Many allege, however, that this is merely a smoke screen for political and moral benefit and that the covert and illegal training of assassins by major intelligence agencies continue, such as at the School of the Americas run by the United States.