In "Tinker, Taylor, Soldier, Spy", "witchcraft" was the material gained from source "Merlin". Which turned out to be an operation to undermine the service and to protect a mole inside it.
In "Tinker, Taylor, Soldier, Spy", "witchcraft" was the material gained from source "Merlin". Which turned out to be an operation to undermine the service and to protect a mole inside it.