Posted by Mike Dennis on April 09, 2014 at 22:44:58 user MTD.
Here in the UK the National Archives have released for public view records for WW1 spies, this has been picked up in the news - the BBC in particular noting that it includes Mata Hari and Arthur Ransome.
Though you can search the archive and see a summary it costs £3.30 to actually view the document.