For the Kuczynskis, fighting fascism by helping the KGB was a Hampstead family business. When a young scientist came to them wanting to share Britain’s nuclear bomb secrets, they knew exactly what to do. Which is how Klaus Fuchs, now called ‘the most dangerous spy in history’ came to be recruited in a cultural centre in Upper Park Road NW3. The family story is told by Stewart Purvis, creator of the ‘Hampstead Spies’ guided walk, who has researched all the files.
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