The "Fast and Furious" imbroglio may have just gone sideways on House Republicans. Just prior to them leading a House vote for contempt against Attorney General Eric Holder on Thursday, a far-reaching investigation published by Fortune magazine poked major holes in the conservative storyline about the alleged gun operation. Claims that law enforcement engaged in a deadly plot to let Mexican outlaws smuggle US guns, the magazine reports, are based on allegations by a lone whistleblower who may in fact be the only person who did any illegal gun-smuggling. The real cause of violence and crime south of the border, it reports, is lax gun laws in Arizona and elsewhere pushed by Republicans and their friends at the National Rifle Association.

To review the allegations in brief: Agents from the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF) supposedly recruited local sellers in Arizona to hawk guns to known smugglers, then monitored the flow of those guns to criminal gangs in Mexico in the hopes of catching "big fish," in a tactic known as "gunwalking" (as opposed to "gun-running"). Two of these ATF-monitored assault weapons ended up at the crime scene where Brian Terry, a US Border Patrol agent, was shot and killed in December 2010. An ATF agent with a crisis of conscience blew the whistle on the operation, dubbed Fast and Furious, and Republicans in Congress began asking questions.

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