During World War II, the civilian Office of Censorship supervised a huge and surprisingly successful program 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 having been made aware of it and understanding its intent.

Secrets of Victory...