U.S. federal agents encouraged an Arizona gun dealer to sell weapons to suspected traffickers for the Mexican drug cartels, even after the dealer warned they would end up in the hands of "bad guys," according to correspondence released by a U.S. senator. Sen. Charles Grassley, an Iowa Republican, released excerpts from an e-mail from an unidentified Arizona gun dealer to a supervisory agent of a Bureau of Alcohol, Tobacco, Firearms and Explosives operation targeting... (GunPolicy.org)