The troopers rushed, clubs flailing, tear-gas canisters exploding, white spectators wildly cheering them on; then Jim Clark’s forces, on horseback, swinging rubber tubes wrapped in barbed wire, and bullwhips, and electric cattle prods, littered the bridge with writhing black bodies splattering blood. The film ran on national TV. Over and over. On NBC, the broadcast cut into a showing of the film Judgment at Nuremberg—a story about what happens when ordinary citizens turn a blind eye to evil.