CHRONOLOGY•xvii1934 The Government Code and Cipher School begins to readmask
traffic. Edith Tudor Hart recruits Kim Philby.
1935 ‘‘Jonny X’’ (Johann De Graaf ) wrecks the Brazilian Communist
revolution.
1936 The Joint Intelligence Committee and Industrial Intelligence
Centre are established.
1937 Mrs. Jessie Jordan is arrested.masktraffic is terminated.
1938 Bletchley Park is purchased as the SIS’s War Station. CPGB of-
ficial Percy Glading, George Whomack, and Albert Williams
are arrested in connection with the Woolwich Arsenal espionage
case.
1939 John King is arrested. Two SIS officers are abducted in the
Venlo Incident. The Intelligence Corps is reestablished.
1940 Tyler Kent and Anna Wolkoff are arrested. Senior Soviet mili-
tary intelligence defector Walter Krivitsky is interrogated. The
Special Operations Executive is established.
1941 The XX Committee is created.
1942 Three Nazi spies are executed in London.
1943 The U.S. Army’s Signal Security Agency begins work on Soviet
traffic. Ormond Uren and Douglas Springhall are arrested.
1944 A deception campaign ensures the success of D-Day.
1945 Igor Gouzenko defects.
1946 Sir Percy Sillitoe is appointed director-general of the Security
Service (DGSS).
1947 Allan Nunn May is arrested. Allan Foote defects.
1948 Grigori Tokaev and J. D. Tasoev defect. The Joint Intelligence
Bureau is established.
1949 Foote’sHandbook for Spiesis published.
1950 Klaus Fuchs is arrested. Bruno Pontecorvo defects.
1951 Guy Burgess and Donald Maclean defect.
1952 Alan Moorehead publishesThe Traitors.
1953 William Marshall is arrested.
1954 Otto John defects. Operationlog cabincommences in Norway.
Vladimir Petrov defects.
1955 Publication of Burgess and Maclean White Paper.
1956 Lieutenant Commander Lionel Crabb disappears. Operation
straggleto seize Suez is initiated.
1957 Communist party member Hor Lung defects in Malaya.