Supreme Court Justice John Marshall Harlan (1833-1911) is best known for condemning racial segregation in his dissent from Plessy v. Ferguson in 1896, when he declared, "Our Constitution is color-blind." But in other judicial decisions--as well as in some areas of his life--Harlan's actions directly contradicted the essence of his famous statement. Similarly, Harlan was called the people's judge for favoring income tax and antitrust laws, yet he also upheld doctrines that benefited large corporations.

Examining these and other puzzles in Harlan's judicial career, Linda...