counter-intelligence
noun/ˌkaʊntər ɪnˈtelɪdʒəns/
/ˌkaʊntər ɪnˈtelɪdʒəns/
[uncountable]- secret action taken by a country to prevent an enemy country from finding out its secrets, for example by giving them false information; the department of a government, etc. that is responsible for this
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counter-intelligence