Yes. For example, it's been mentioned that the OPP had undercover operatives in the Ottawa protest. We don't know what they came up with. I really think that you can only fully investigate this if you do so in a manner that is in camera, subject to national security confidentiality.
I would add that I think that, moving forward, you should consider that an inquiry would have powers to go behind solicitor-client privilege. NSIRA, for example, has those powers.