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Emil Julius Klaus FUCHS: German/British. The atom spy, Klaus FUCHS, was an anti-Nazi...

Catalogue reference: KV 2/1256

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This record is about the Emil Julius Klaus FUCHS: German/British. The atom spy, Klaus FUCHS, was an anti-Nazi... dating from 1950 Jan 01 - 1951 Dec 31 in the series The Security Service: Personal (PF Series) Files. It is held at The National Archives, Kew.

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Full description and record details

Reference
KV 2/1256
Date
1950 Jan 01 - 1951 Dec 31
Description

Emil Julius Klaus FUCHS: German/British. The atom spy, Klaus FUCHS, was an anti-Nazi agitator and Communist in Germany in the early 1930's. He fled to the UK in 1933. After studies in Bristol and Edinburgh and research work in Birmingham, he became a member of the British team engaged, jointly with their US counterparts, in developing the atom bomb. He worked on this project in the United States from 1943 to 1945. On returning to the UK FUCHS worked for the Atomic Energy Research Establishment Harwell, becoming head of its Department of Theoretical Physics. In 1942 FUCHS volunteered his services to the Russians and was run by a series of case officers (both KGB and GRU) and their intermediaries both in the UK and US until 1949 when he ceased contact. During this period he passed to his handlers detailed and damaging information about the atom bomb project. FUCHS' arrest in 1950 followed an investigation which concluded that he matched the details provided by a sensitive US source. FUCHS' subsequent conviction in 1950 (he received a 14 year sentence) rested solely on his own detailed confession, elicited over numerous interviews. The investigation itself produced no evidence of his espionage. Following his conviction FUCHS was deprived of his British Nationality. These papers provide detailed accounts of FUCHS' career as a spy, his complex personality and motivation, his relationships with his father (in particular) and Harwell colleagues and the circumstances surrounding his arrest and conviction

Note
With an important case summary at serial 756a; FUCHS identifies Ursula BUERTON as one of his UK contacts at serial 759a
Held by
The National Archives, Kew
Former department reference
PF 62251 VOL 12
Legal status
Public Record(s)
Access conditions
Retained Until 2003
Closure status
Open Document, Open Description
Subjects
Topics
Europe and Russia
Fascism
Nuclear energy
Research
Weapons
Intelligence
Americas
Communism
Record URL
https://beta.nationalarchives.gov.uk/catalogue/id/C11134987/

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Series information

KV 2

The Security Service: Personal (PF Series) Files

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Catalogue hierarchy

Over 27 million records

This record is held at The National Archives, Kew

6,152 records

Within the department: KV

Records of the Security Service

4,773 records

Within the series: KV 2

The Security Service: Personal (PF Series) Files

You are currently looking at the piece: KV 2/1256

Emil Julius Klaus FUCHS: German/British. The atom spy, Klaus FUCHS, was an anti-Nazi...

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