The Security Service of the Republic is an intelligence and police agency responsible for domestic intelligence-gathering, investigating political crimes and terrorism, and investigating alien crime. It is the oldest and most prestigious branch of the Republic Security Department.

The Security Service includes several sub-agencies, including the Secret Police, the Alien Crimes Directorate, and the Intelligence and Information Directorate. The agency also commissions individual agents for special investigations and tasks, who report directly to the Security Service headquarters.

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