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Double agent - Wikipedia
Double agent Definition & Meaning - Merriam-Webster
6 Daring Double Agents | HISTORY
The Spy Who Kept the Cold War From Boiling Over | HISTORY
Thirty Years Later, We Still Don't Truly Know Who Betrayed …
World Wars: Double Cross - MI5 in World War Two - BBC
Double agent | espionage | Britannica
Double Agents | Encyclopedia.com
Secrecy and Subjectivity: Double Agents and the Dark …
Robert Philip Hanssen, double agent, 1944-2023 - Financial Times