From December 19, 1941, until August 15, 1945, the Office of Censorship had the power to censor international communications at its "absolute discretion." With a staff of more than 10,000 censors, the office routinely examined mail, cables, newspapers, magazines, films, and radio broadcasts. Its operations constituted the most extensive government censorship of the media in U. S. history and one of the most vivid examples of the use of executive emergency powers.
Classified as "confidential" until 1971, the thousands of pages of the authoritative History of the Office of Censorship, written and compiled by the managers of the office, are being published for the first time. In addition to being a detailed account of the functioning of the office, this History of the Office of Censorship provides an interesting background to the security precautions that surrounded the planning for D-Day, the introduction of radar, and the evolution of the Manhattan Project.