Federal agents hunt for guns one house at a time | Chronicle | Chron.com – Houston Chronicle.

Success on the front lines of a government blitz on gunrunners supplying Mexican drug cartels with Houston weaponry hinges on logging heavy miles and knocking on countless doors. Dozens of agents from the Bureau of Alcohol, Tobacco, Firearms and Explosives — sent here from around the country — are needed to follow what ATF acting director Kenneth Melson described as a “massive number of investigative leads.”