In 1939, fifty million Americans went to the movies every week, Louis B. Mayer was the highest-paid man in the country, and Hollywood produced 530 feature films a year. One decade and five thousand movies later, the studios were faltering. The 1940s became the decade of Hollywood's decline: anticommunist hysteria excommunicated some of its best talent, while a 1948 antitrust consent decree ended many of the business practices that had made the studio...