How did Fast and Furious come to light and who was Brian Terry?Border Patrol Agent Brian Terry was gunned down on Dec. 14, 2010 in Arizona just north of the Mexican border, allegedly by illegal aliens armed with at least two AK-47 variant rifles trafficked by Fast and Furious suspects who had not been arrested by ATF. The public was not told about the link between Terry's murder and Fast and Furious, nor was the gunwalking revealed. But ATF insiders began sharing their concerns anonymously online, including to the forum CleanupATF.org. Gun rights advocates including David Codrea and Mike Vanderboegh wrote extensively on the controversy and rumors surrounding Terry's death, and the allegation that ATF was attempting to "bump up its case numbers" by letting large numbers of guns "walk" into the hands of Mexican drug cartels. Several ATF agents became whistleblowers and contacted Sen. Charles Grassley (R-Iowa), who began investigating the controversy in Jan. 2011. CBS News spoke to a half dozen ATF sources and reported the story on Feb. 22, 2010.On March 3, 2010, the first ATF whistleblower, John Dodson, spoke publicly to CBS News.