The NAACP, the nation's oldest civil rights organization, is refusing to cooperate with an IRS investigation into whether its chairman made an improper political speech, charging that the timing of the probe was itself politically motivated. The National Association for the Advancement of Colored People said in October that the group's tax-exempt status was under review after its chairman, Julian Bond, gave a speech that criticized President Bush. In a letter to the IRS on Thursday, NAACP attorneys said the group will not hand over documents requested in the probe and argued that the IRS followed improper procedure by launching...