To report an imminent threat call 999 or ring the Anti-Terrorist Hotline on 0800 789 321
Current national threat level: SUBSTANTIAL Read more about threat levels >>
To report an imminent threat call 999 or ring the Anti-Terrorist Hotline on 0800 789 321
Current national threat level: SUBSTANTIAL Read more about threat levels >>
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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
Latest News
view ALL NewsDirector General statement on London Bridge attack
Director General statement on London Bridge attack
Seeing MI5 differently
International Day for Persons with a Disability gives MI5 the opportunity to confirm our commitment to working together...
Director General talks technology with Financial Times
MI5 Director General Sir Andrew Parker gave an interview to the Financial Times, in which he highlighted the crucial...
