Back in Washington, House Oversight Committee Chair Henry Waxman is calling for a sweeping new probe of the private military firm Blackwater Worldwide. On Monday, Waxman asked the IRS and the Labor Department to investigate Blackwater’s classification of its mercenaries as “independent contractors” rather than employees. The move has allowed Blackwater to avoid up to $50 million in taxes and qualify for hundreds of millions in contracts reserved for small businesses.