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The release of a batch of Security Service (M15) files has provided new information about Welsh-related cases from World War I to the early 1950s. The 357 files constitute the largest release of records by the National Archives in Kew.
BBC Wales' Diplomatic Correspondent, Guto Thomas, has been to the archives, and found four cases of Welsh interest.
The files involve Paul Robeson, poet and communist Nicholas of Glais and plans for a detainment camp in Rhyl.
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The release of the documents is the first since the Freedom of Information Act came into force in January.
Among the documents are files relating to the Security Service's attitudes towards Paul Robeson's invitation to participate in the South Wales Miners' Eisteddfod in 1951.
There are records of surveillance against the poet and communist, the Reverend Nicholas of Glais and details of post-war plans to intern subversive individuals in Rhyl in the event of the outbreak of another war.
Remarkably, there is also a file linking the Berni Inn hotel and restaurant chain in south Wales, with an Italian fascist group based in Cardiff.