espionage

as in spying
the secret gathering of information on others the acts of espionage on behalf of the Confederacy carried on by Belle Boyd and Rose Greenhow

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“Espionage.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/espionage. Accessed 22 Feb. 2024.

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