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 NewsView all news
As part of the Integrated Review Refresh, the government has announced the creation of the National Protective Security...
A statement from MI5 Director General Ken McCallum following the publication of the third volume of the Manchester...