The Plowshares movement was begun in 1980 by Fathers Daniel and Philip Berrigan to oppose the existence of nuclear weapons. Members of the movement entered missile bases, hammered on nose cones, and poured blood on weapons to call attention to the ethical isues associated with continuation of massive support of the defense industry. The Berrigans, following the French philosopher Simone Weil, held that wars have no rational objective but are fought...