Nigger: it is arguably the most consequential social insult in American history, though, at the same time, a word that reminds us of “the ironies and dilemmas, tragedies and glories of the American experience.” In this tour de force, distinguished Harvard Law School professor Randall Kennedy—author of the highly acclaimed Race, Crime, and the Law— “put[s] a tracer on nigger,” to identify how it has been used and by whom, while analyzing the controversies to which it has given rise.

With unprecedented candor and insight Kennedy explores such questions as: How should nigger be defined? Is it, as some have declared, necessarily more hurtful than other racial epithets? Do blacks have a right to use nigger even as others do not? Should the law view nigger baiting as a provocation strong enough to reduce the culpability of a person who responds violently to it? Should a person be fired from his or her...