Gun-control advocates have long protested the "gun-show loophole." The term refers to the fact that private sellers at gun shows are not required, under federal law, to conduct background checks on potential buyers, even though gun dealers who operate private gun shops must do so. Critics say the loophole makes it easier for criminals to obtain lethal weapons and thereby facilitates crime. In response, a number of states have passed their own laws to regulate gun-show... (GunPolicy.org)