For years conservative groups and especially the National Rifle Association have been warning that the government would find a way to confiscate the guns of law-abiding Americans. Many dismissed what they regarded as a scare tactic designed to raise money. What is happening in St. Louis should awaken us to the fact that those fears are well founded. The top prosecutor in St. Louis has charged a married couple with "felony unlawful use of a weapon for displaying guns during a racial injustice protest outside their mansion." Mark and Patricia McCloskey, who the media identify as being "white," are in...