I’m not sure what bright spark at the Bureau of Alcohol, Tobacco, Firearms and Explosive (and Really Big Fires) came up with the term “Iron River.” Maybe it was a journalist, and the ATF simply glommed on to the term. But it’s an excellent moniker: an easy-to-remember nickname for a trade that no God-fearing, tax-paying, freedom-loving American would support. Who wants thousands of highly deadly assault rifles flowing from the U.S. to Mexico, into the hands of ruthless criminals? Nobody (except maybe evil gun dealers and rapacious gunmakers). So who you gonna call? The ATF! Truth be told, the Iron...