St. Tammany Parish Councilman Joe Impastato was arrested Tuesday for allegedly extorting a $100,000 kickback in connection with a Hurricane Katrina debris removal contract, a case that authorities called the opening salvo in a corruption crackdown by a task force weeding out fraud in storm-related contracts worth tens of billions of dollars. Impastato was arrested during an FBI sting as he accepted two cashier's checks totaling $85,000 from a subcontractor cooperating with authorities, U.S. Attorney Jim Letten said at a news conference Wednesday. Impastato, 33, who represents the Lacombe area, is accused of extorting 50 cents on the dollar from...