Night Witches
Night Doctors, also known as Night Riders, Night Witches, Ku Klux Doctors, and Student Doctors, are bogeymen of African American folklore, with some factual basis. Emerging from the realities of grave robbing, enforced and punitive medical experimentation, and intimidation rumors spread maliciously by many Southern whites, the Night Doctors' purpose was to further prevent slaves, freedmen, and black workers leaving for the North of the United States, in a prescient foreshadowing of the inevitable events during the early to mid 20th century, now known as The Great Migration.