The Canadian Security Intelligence Service (CSIS) provides advance warning to government departments and agencies about activities which may reasonably be suspected of constituting threats to the country's security. CSIS does not have the mandate to conduct foreign intelligence operations outside of Canada. CSIS is a defensive, domestic security intelligence service. Other government departments and agencies, not CSIS, have the responsibility to take direct action to counter the security threats. CSIS does not have law enforcement powers, therefore, all law enforcement functions are the responsibility of police authorities. The splitting of functions, combined with comprehensive legislated review mechanisms, ensures that CSIS remains under the close control of the federal government.
Government - National - Foreign
The Service uses a variety of collection methods to monitor individuals or groups whose activities are suspected of constituting a threat to national security. Through such monitoring, the Service is able to identify individuals with suspected connections to terrorism and persons operating in Canada on behalf of hostile intelligence services. In addition to monitoring potential espionage and sabotage efforts, the Service is mandated to inform the government of foreign-influenced activities within or relating to Canada that are detrimental to the interests of Canada and are clandestine or deceptive or involve a threat to any person.