The Crime and Security Branch (CSB) (Irish: Brainse Coireachta agus Slándála) – previously known as C3 – is responsible for the administration of national security, counter terrorism and serious crime investigations within the Garda Síochána, the national police force of Ireland. The section oversees intelligence relating to subversive, paramilitary and terrorism matters, conducts counter-intelligence, liaises with foreign law enforcement agencies, handles confidential informants, administers VIP and witness protection, monitors potential corrupt Garda officers and provides information on threats to the state to the Garda Commissioner and Government of Ireland.
