From martyr to insult, how “Uncle Tom” has influenced two centuries of racial politics. Jackie Robinson, President Barack Obama, Supreme Court Justice Clarence Thomas, O.J. Simpson and Christopher Darden have all been accused of being an Uncle Tom during their careers. How, why, and with what consequences for our society did Uncle Tom morph first into a servile old man and then to a racial epithet hurled at African American men deemed, by other Black people, to have...