Mitterrand revealed that France had a private sector company, Thomson-CSF, working on contracts in Moscow, and through it French intelligence had achieved a very deep penetration of the KGB. It had in place a key Soviet source who was voluntarily providing astonishing national security information about Soviet technology acquisition from the West, including massive theft of technological secrets. Thus was revealed the famous “Line X” KGB espionage network by one of the most precious and extraordinary “moles” the West ever had. The “Farewell” case was born.
