“In Colfax, La., on Easter Sunday 1873, a mob of white insurgents, including ex-Confederate and Union soldiers, led an assault on the Grant Parish Courthouse, the center of civic life in the community, which was occupied and surrounded — and defended — by black citizens determined to safeguard the results of the state’s most recent election. They, too, were armed, but they did not have the ammunition to outlast their foes, who, outflanking them, proceeded to mow down dozens of the courthouse’s black defenders, even when they surrendered their weapons. The legal ramifications were as horrifying as the violence — and certainly more enduring; in an altogether different kind of massacre, United States v. Cruikshank (1876), the U.S. Supreme Court tossed prosecutors’ charges against the killers in favor of severely limiting the federal government’s role in protecting the emancipated from racial targeting, especially at the hands of the Ku Klux Klan.”