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Censorship: Policy and Practice During the Second World War

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Beige background with red and black lettering. The left hand side is a letter header to the Ministry of Information, stamped with a red SECRET stamp. Underneath it reads "U.S. Secret Equals British Secret Confidential". On the right hand side are various symbols depicting a code language.
The work of the Censorship is of a highly confidential nature and must on no account be discussed outside the rooms in which it is actually carried on
Handbook of Instructions and Orders for the Postal Censorship Staff, DEFE 1/36/11

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Uncover hidden aspects of the Second World War through the eyes of government censors

A red cover of a manual titled Manual for Chief Censors Overseas.
An illustration of a table and chairs, used in censorship offices.

Censorship: Practice and Policy during the Second World War explores British postal and telegraph censorship throughout a pivotal era of modern history. The collection contains over 17,000 images drawn from Ministry of Defence files at The National Archives. It begins by surveying the first tentative steps that were taken, following the outbreak of conflict in 1939, to implement and to co-ordinate censorship. Documents reveal how hastily-assembled censorship teams looked back to the First World War for lessons and instructional precedents whilst adapting to the major technological developments that had occurred since. The work undertaken by censorship units—which necessitated keeping a close eye on all communications that could reveal sensitive or dangerous information to the enemy—soon became one of the most important, if somewhat underappreciated, fronts in the so-called “secret war”.

Censorship became a wide-ranging, international endeavour. It involved not just Britain, but also the Dominions, colonies, allies (including the USA), and neutral states such as Ireland. Censorship teams sprung up across the globe, typically employing local people, especially women. They worked round the clock, ensuring that all correspondence was assessed, flagged (if necessary), and passed on swiftly. Policies, instructions, and official guidance poured out from London with a view to keeping the censorship system efficient and watertight. Censors from a wide variety of backgrounds became adept at breaking codes and recognising suspect material, even if it was cleverly concealed.

Towards the end of the war and following the Allied victory, censorship units took on a new responsibility: monitoring communications amongst the populations in occupied territories, including Austria, Germany, and Italy. This was not merely a security measure; it also provided an important barometer of public morale—a way of appraising the attitudes of former enemy civilians. As this fascinating collection illustrates, censorship was not only a tool that helped win the war, it was also a vital part of securing the peace which followed.

This collection is a rich resource for students and researchers with interests in military and political history, the history of the British empire, international relations, and security and intelligence.

Contents

Censorship: Policy and Practice During the Second World War...

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Beige background with black lettering. Various symbols depicting a code language.

Highlights

White text on black background with title Do You Know?, listing 6 rules about censorship of materials being taken in/out of the colony

Licensed to access DEFE 1/209 - Overseas Censorship: Inspections of Caribbean Censorship Stations

The war necessitated a concerted effort to educate people in Britain and throughout the empire on censorship policy. This document (image 542), issued in Trinidad, warns people that “all written, printed, photographic, and recorded material you may wish to take out of the Colony MUST be censored”.

Black type on beige background, describing how POWs evaded censorship to communicate forced labour and character of work. Below a photograph of a censored letter demonstrating these techniques is included

Licensed to access DEFE 1/211 - Overseas Censorship: United States Censorship Procedures and Publications

Innovative ways to evade censorship were always being developed. This document (images 46–55) reveals how Japanese prisoners of war created codes, based on anagrams, to convey information about their conditions and treatment.

Confidential British Civil Censorship (Austria) report, dated 19 September 1947. On the right is a red M. I .11 stamp dated 24 September 1947.

Licensed to access DEFE 1/398 - Reports on Civil Censorship in Austria and Germany

Towards the end of the war, and following the Allied victory, censorship was geared increasingly towards gauging public opinion in former enemy territories. This document (images 16–30) considers Austrian responses to the British occupation. It surveys people’s feelings on wages and the availability of food, as well as attitudes towards the British and Nazism.

Black type on beige background, discussing conflict between Security and Censorship departments

Licensed to access DEFE 1/160 - Overseas Reports: Report on the Jamaica Censorship Station

Spanning its empire, Britain’s censorship network was vast. It generated employment for local communities, particularly for women. Unfortunately, censorship offices were not devoid of gender and racial tensions. This report (images 10–23) recommends that further staff appointments to the Jamaica office should be “British-born” and “supplied from outside the island”.

Insights

  • The creation of an effective censorship network was a significant logistical undertaking for Britain’s war-time government. Censorship offices had to be designed, constructed, furnished, and, crucially, staffed, across the empire. All of this generated a hefty administrative paper-trail, which this collection showcases. It contains blueprints for, and images of, censorship buildings in Trinidad; designs for sorting tables used in censorship offices; and progress reports on the development of censorship infrastructure penned by British officials.

  • Ensuring that staff were properly briefed on, and trained in-line with, censorship policy was of the utmost importance to the British government. Indeed, the rapid expansion of the wartime censorship network across the breadth of the empire meant that censorship offices frequently employed local people, many of whom had no previous experience in this field. This collection provides numerous examples of the rigorous official guidance and technical training documents that were relayed to censors throughout Britain and beyond.

  • Although Britain established its own extensive network, censorship was, by its very nature, a co-operative endeavour. As many documents in this collection illustrate, Britain’s censorship department worked closely with its Allied counterparts, such as the United States, as well as with the neutral Republic of Ireland, with which it shares a border.

  • A good deal of time and thought was given over to comprehending how censorship was operating in enemy states as well as in Allied territories. For example, the collection contains maps of German postal districts and guides to censorship stamps used in Nazi Germany, Vichy France, and Japan. There are also official documents explaining how censorship practices varied in areas under Nazi rule and detailing censorship instructions that were issued to the public throughout the Third Reich.

  • Ultimately, careful thought had to be given as to how Britain’s elaborate censorship system was to be wound-down. This was a tricky process, not least because it had to harmonise with post-war censorship practices and timetables adopted by Allied states, especially the US. Precisely how censorship was to operate in recently occupied territories, such as Germany and Japan, and how long it would last, were also among the tough questions facing British officials in the wake of victory.

Colour poster by William Little issued in 1941 showing two groups of armed marching soldiers, one from each of the countries allied to fight Germany, Japan, and Italy, facing a giant V for victory composed of the flags of each of the countries allied in the fight.

Licensed to access British Government Information and Propaganda, 1939-2009

1939   2009
Coloured illustration of a British town being bombed. On the left a black and white soldier points to the sky.

Licensed to access Britain Under Threat: Civil Defence in the Era of Total War, 1914-1989

1914   1989
A cover of The Illustrated War News, including an illustration of a tank, the Union Jack flag, and the French flag.

Licensed to access Illustrated War News, 1914–1918 & 1939

1914   1939
An image of an aircraft spotter searching the sky with binoculars during the Battle of Britain, World War 2. St. Paul's Cathedral is in the background.

Licensed to access Military Intelligence Files: Land, Sea & Air, 1938-1974

1938   1974
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