mole

as in spy
a person who tries secretly to obtain information for one country in the territory of another usually unfriendly country for years we have had a mole in the enemy's national intelligence agency

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“Mole.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/mole. Accessed 19 Mar. 2024.

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