NATO’s Secret Armies by Daniele Ganser explores the CIA/MI6-backed "stay-behind" networks created across Western Europe during the Cold War to counter potential Soviet occupation. These secret, NATO-linked armies, including Italy's Gladio, operated clandestinely, sometimes conducting right-wing terrorism, massacres, and political manipulation. The book documents a secret facet of the Cold War where anti-communist paranoia led to the establishment of anti-democratic structures within democratic states.