Agents, informants and traitors

The history of espionage accompanies humanity and all the empires that have needed to protect themselves and watch their enemies. From the Romans to the Cold War superpowers, adversary intelligence has been yet another weapon, often the instrument that has succeeded in disrupting the most elaborate military operations. At present, espionage continues alongside governments, unscrupulous businessmen, and anonymous hackers, capable of obtaining thousands of data remotely.