UNITED NATIONS - The U.N. employees union has criticized Secretary-General Kofi Annan for retaining his former chief-of-staff as an adviser despite accusations the aide authorized shredding three years of files on the corrupt oil-for-food program for Iraq. The Independent Inquiry Committee led by former Federal Reserve chairman Paul Volcker criticized Iqbal Riza for giving approval to shred the documents on April 22, 2004 — a day after the U.N. Security Council authorized an investigation into the oil-for-food program. A resolution adopted by the Staff Council, the union's executive, and obtained Thursday by The Associated Press, said keeping Riza as a...