While criticism surrounding Operation Fast and Furious has so far focused on the Bureau of Alcohol, Tobacco and Firearms, three other federal agencies knew about the operation and some of their agents tried to stop it, according to the former chief of the U.S. Drug Enforcement Administration in Tucson. Tony Coulson, the DEA's agent in charge of Southern Arizona during Fast and Furious, says many federal field agents knew the ATF was walking guns to Mexico, but supervisors told them to back off when they objected.

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