That was Dubya's idea, actually. You remember him, don't you? ......or not.....
But unlike Obama, Bush's project traced the guns, arrested bad guys and it was shut down once the cartels caught on. Obama let the guns go untraced, nobody was busted and it kept feeding guns to criminals until the Republican Congress stopped it.
By the way,...do you really think that "They're not in Chicago anymore and haven't been for a long time. "?