During World War II, the civilian Office of Censorship supervised a huge and surprisingly successful programme of news management: the voluntary self-censorship of the American press. In January 1942, censorship codebooks were distributed to all American newspapers, magazines and radio stations with the request that journalists adhere to the guidelines within. Remarkably, over the course of the war no print journalist, and only one radio journalist ever deliberately violated the censorship code after being informed of its intent. Secrets of Victory examines the World War II censorship programme and analyzes the reasons for its success. Using archival sources, including the Office of Censorship's own records, Michael Sweeney traces the development of news media censorship from a pressing necessity after the attack on Pearl Harbour to the centralized yet efficient bureaucracy that persuaded thousands of journalists to censor themselves for the sake of national security. At the heart of this often dramatic story is the Office of Censorship's director Byron Price. A former reporter himself, Price relied on the cooperation rather than coercion of American journalists in his fight to safeguard the nation's secrets.