The relationship between law and morality has emerged as the central question in the jurisprudential reflection of our time. Those who call themselves positivists hold with H.L.A. Hart that calling a statute or a judicial decision law need not carry any implications about the morality of that statute or decision. Valid laws might be immoral or unjust. Those who resist this reduction of law to valid enactments sometimes argue, with Lon Fuller, that moral acceptability is a necessary condition for holding that a statute is law; or, with Ronald Dworkin, that moral principles supplement valid enactments as components of the law. Whether the positivists or their moralist opponents are right about the nature of law, all seem to agree about th...