i heard fbi
They do have the authority to preform an arrest if life/lives are in danger or the threat is of a pressing nature but they mostly stay undercover and collect information.
if they have information on you (Say you have ties with terrorists or are a bomb maker) then they will assign a team to watch you round the clock and gather information, then after they have enough information to bust you they will have the RCMP make the arrest. watch for strange people and cars, they are real secret agents and they will document everything you say and do.
you seem to know quite a bit on these things.
so if the CSIS is the canadian equivalent of the CIA, what's the canadian equivalent of FBI, then?