DOJ head knew of ATF "gunwalking" in April 2010Sharyl AttkissonWASHINGTON - There is new information about how much the Department of Justice new about the controversial ATF tactic of letting guns "walk" into the hands of criminals. Gunwalking is a controversial investigative tactic in which police allow suspects to traffic guns without stopping them in order to see where they end up. Documents just released this afternoon show the head of the Justice Department's criminal division, Lanny A. Breuer, learned about the tactic of ATF gunwalking as early as April of last year. In a memo, Brueuer's deputy wrote...