The Canadian Security Intelligence Service (CSIS) is Canada's primary intelligence agency, responsible for investigating threats to national security including terrorism, espionage, foreign interference, and other activities that threaten Canada's safety and interests. Unlike the RCMP, which is a police force that can make arrests, CSIS focuses on intelligence collection and analysis, advising the government about security threats. CSIS operates under judicial oversight, requiring warrants for intrusive activities. The agency works with foreign intelligence partners and Canadian law enforcement. While CSIS operates nationally, security threats may affect local communities, and municipalities may interact with security agencies regarding infrastructure protection or event security.