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MI5 BETWEEN THE WARS

The years immediately after the First World War saw MI5's size being reduced drastically as a result of post-war cost-cutting. The Service's very existence came under threat for a time, but by the start of the 1930s it had gained new importance in countering communist and fascist subversion in the UK. It also played a leading role in countering Soviet espionage and obtaining information on Nazi Germany.


The inter-war years
MI5's fight for survival after World War I and its penetration of Nazi Germany's London embassy

The Soviet threat between the wars
How MI5 countered Soviet intelligence activities in the UK

Fact or Fiction?
There is an underground tunnel linking MI5 and SIS.

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Latest News

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Director General Ken McCallum makes first public address

MI5 Director General Ken McCallum made his first public address on 14 October where he laid out his top priorities.

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MI5 marks Black History Month 2020

Throughout October, MI5 will again be marking Black History Month with a series of internal events.

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