The United States is conducting a secret 'dirty tricks' campaign against UN Security Council delegations in New York as part of its battle to win votes in favour of war against Iraq. A leaked memorandum makes clear that the target of the heightened surveillance efforts are the delegations from Angola, Cameroon, Chile, Mexico, Guinea and Pakistan at the UN headquarters in New York -- the so-called 'Middle Six' delegations whose votes are being fought over by the pro-war party, led by the US and Britain, and the party arguing for more time for UN inspections, led by France, China and Russia.