I would like to provide some additional information.
Paragraph 2(a) of SCISA deals with activities that undermine the security of Canada. The passage reads as follows:
(a) interference with the capability of the Government of Canada in relation to intelligence, defence, border operations, public safety, the administration of justice, diplomatic or consular relations, or the economic or financial stability of Canada;
I guess that's the reason for the 17 institutions. Each one has a role to play, based on the definition in that paragraph.