Overseer promised skeptical agents ‘most fun’ with ATFThe central characters in the failed “Fast and Furious” firearms investigation were 19 men and one woman, all legal residents of the U.S., accused of laying down hundreds of thousands of dollars in illicit cash at Phoenix-area gun shops to buy an arsenal of high-powered weapons for Mexican drug smugglers. Between September 2009 and December 2010, congressional investigators said, they purchased or aided in the purchase of more than 2,000 AK-47 assault weapons, Barrett .50-caliber sniper rifles, FN 5.7mm semi-automatic pistols and other assorted rifles, shotguns and handguns that later were “walked” into...