1. Abel, Rudolph 1
  2. Abwehr 1, 2, 3, 4
  3. Acton, Harold 1
  4. Adeane, Sir Michael 1, 2, 3, 4
  5. Aeroflot 1, 2
  6. Afghanistan 1, 2
  7. Aitken, Jonathan 1, 2, 3, 4, 5, 6
  8. Andrew, Christopher 1
  9. Angleton, James 1, 2, 3, 4, 5
    1. and Gaitskell 1
    2. and Hollis 1
    3. and moles 1, 2
    4. and Penkovsky 1
  10. Anglo–German Fellowship 1
  11. Arago affair 1
  12. Armstrong, Sir Robert 1, 2
  13. assassinations 1, 2
  14. Atomic Energy Commission 1, 2, 3, 4
  15. Atomic Weapons Research establishment 1, 2, 3, 4
  16. atomic weapons see nuclear weapons
  17. Attlee, Clement 1, 2, 3, 4, 5, 6
  18. August, Frantisek 1, 2
  19. Australia 1, 2, 3
    1. and Ellis 1, 2, 3