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Noun: secret police
  1. A police force that operates in secrecy (usually against persons suspected of treason or sedition)
    "The secret police monitored dissident groups"

Type of: Bill [Brit, informal], boys in blue [informal], constabulary, fuzz [informal], law, Old Bill [Brit, informal], police, police force, polis [UK, dialect, informal], the fuzz [informal]

Encyclopedia: Secret police