Alex Younger, head of MI6, yesterday described Mr Foley as a man of “dignity, compassion and bravery”.
He added: “As a consummately effective intelligence officer he witnessed at first hand the Nazi seizure of power, and the horrors and depravity of the regime.
“While many condemned and criticised the Nazis’ discriminative laws, Frank took action. With little regard for his personal safety he took a stance against evil.”
Mr Foley is estimated to have helped to save the lives of about 10,000 Jews, almost all from Germany.
Later, during the Second World War, Mr Foley was given the task of questioning Hitler’s deputy, Rudolf Hess, after his flight to Scotland.
In 1949 Mr Foley retired to Stourbridge, in the West Midlands, where he died in 1958, aged 73.