Because of both the secrecy of secret services and the controversial nature of the issues involved, there is some difficulty in separating the definitions of secret service, secret police, intelligence agency etc. Secret police (sometimes political police) are a Police agency which operates in Secrecy to maintain National security against internal An intelligence agency is a governmental agency that is devoted to the Information gathering (known in the context as " intelligence " For instance a country may establish a secret service which has some policing powers (such as surveillance) but not others. Surveillance is the monitoring of Behavior. Systems surveillance is the process of monitoring the behavior of people objects or processes within systems for conformity A secret police may also be said to be a secret service. Secret police (sometimes political police) are a Police agency which operates in Secrecy to maintain National security against internal The powers and duties of a government organization may be partly secret and partly not. The organization may be said to operate openly at home and secretly abroad, or vice versa.