Harlan. Known today to every student of constitutional law, principally for his dissenting opinions in early racial discrimination cases, Harlan was an important actor in every major public issue that came before the Supreme Court during his thirty-three-year tenure.

Named by a hopeful father for Chief Justice John Marshall, Harlan began his career as a member of the Kentucky Whig slavocracy. Loren Beth traces the young lawyer's development from these early years through the secession crisis and Civil War, when Harlan remained loyal to the Union, both as a politician and as a...