For two hundred years, the constitutionality of capital punishment had been axiomatic. But in 1962, Justice Arthur Goldberg and his clerk Alan Dershowitz dared to suggest otherwise, launching an underfunded band of civil rights attorneys on a quixotic crusade. In 1972, in a most unlikely victory, the Supreme Court struck down Georgia's death penalty law in Furman v. Georgia. Though the decision had sharply divided the justices, nearly everyone, including...