The Cruikshank case, formally known as United States v. Cruikshank, was a landmark Supreme Court case decided in 1876 that dealt with the rights of African Americans and the federal government's authority to protect those rights. This case arose from the Colfax Massacre, where white supremacists attacked a group of Black citizens in Louisiana, leading to questions about the enforcement of the Reconstruction Amendments and the limits of federal power in protecting civil rights.