A small file of correspondence and a set of minutes addressed to the Lord President relating to a planned visit to the USSR by twenty-nine British scientists on the occasion of the 220th anniversary of the Soviet Academy of Sciences in June 1945. Subjects covered in the file include the potential danger to the security of British scientific research, and possible means to prevent particular members of the group from travelling to the Soviet Union for unspecified reasons; a note from the Prime Minister requests information regarding these "doubtful ones".