Between The Wars

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 news
Hilda Matheson image with rainbow background

This February MI5 is proud to be marking LGBT+ History Month. In keeping with this year’s 'art' theme,...

MI5, along with SIS and GCHQ, has published its Gender Pay Gap report for 2021.

Fact or Fiction

MI5 once used Wormwood Scrubs prison as our headquarters
loader