The Department of Justice (DOJ) published a new federal regulation Wednesday that will expand the regime of federal firearms background checks to cover guns purchased online, at gun shows and in informal markets. In August of 2023, the Federal Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) announced a new rulemaking proposal to redefine when someone is “engaged in business” as a gun dealer subject to background check regulations, using new authorities granted by a bipartisan gun control law passed by Congress following a deadly school shooting at Uvalde, Texas in 2022. The measure i…