The fact that CSIS can take preventive action, even unlawfully under the legislation resulting from Bill C-51, does indeed bring to mind the actions of the RCMP. In fact, it's exactly why intelligence work was separated from police action at the time. The problem is that CSIS does not seek to gather evidence that will lead to criminal charges in a context where the accused will be able to defend himself in a fair and impartial process. Instead, things are done clandestinely.
As a result, people are sometimes subject to these police actions, as they were in the 1960s or 1970s, without being aware of it, and are then unable to contest the actions. The data banks of certain organizations can be destroyed, activities can be sabotaged, etc. Action is taken against individuals in the dark, as part of a framework that doesn't keep them informed, even after the fact. The rights of these people are infringed, but they have no way to challenge it. That is not an acceptable way to protect our country.