CSIS is more analogous to the CIA. It's an intelligence service, not a police service. But the US have a lot of specialized police agencies -- the RCMP is also

CSIS is more analogous to the CIA. It's an intelligence service, not a police service. But the US have a lot of specialized police agencies -- the RCMP is also the DEA, the Secret Service, the US Marshals... probably many more I'm forgetting or don't even know about.