"This is like putting Jack the Ripper in charge of a women's shelter," said Hillel Neuer, head of Geneva-based UN Watch, announcing that the organisation would organise protest events involving Iranian dissidents.
The leadership of the UN Conference on Disarmament rotates automatically in alphabetical order among its 65 member nations, and Iran is scheduled to take the helm on May 27 for a session running until June 23.
The organisation, which is affiliated with the American Jewish Committee, urged the United States, European Union and UN Secretary General Ban Ki-moon to speak out, despite the fact that diplomatic protocol dictates who will preside over conference sessions.
"When the United Nations imposes four rounds of sanctions on Iran for illicit nuclear activities, condemns it for illegally arming the murderous Syrian regime, and denounces Tehran's massive abuse of human rights, this kind of appointment just defies common sense and harms the UN's credibility," said Neuer.
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The conference was launched in 1979 to try to stem the Cold War arms race.
Its 2013 agenda includes striving to craft a deal on nuclear disarmament, preventing arms from spreading to outer space and halting the development of other weapons of mass destruction.
In the past, its debates have paved the way for treaties on non-proliferation of nuclear arms, and biological and chemical weapons.