The IRS was in the hot seat Friday, with its outgoing acting commissioner . A Senate panel is scheduled for Tuesday. Congress is prodding to find out why the agency singled out conservative groups for special scrutiny. Attention has focused on the IRS' flagging of these groups starting in 2010. But some liberal groups and journalism organizations say their applications for tax-exempt status also faced long delays and were closely scrutinized during the same period. The year 2010 began a busy period for the IRS office in Cincinnati, the home of the tax-exempt determinations unit. That January, the Supreme Court...