I would echo that there needs to be an independent civilian oversight rather than bundling this into the Privacy Commissioner.
I'll start by saying what I should have said at the outset as well, which is that I want to also congratulate you on the reforms to the Privacy Act, which look great. There's a lot of good stuff in there.
Generally speaking, we've talked about how this is a privacy concern, but it also touches on freedom of expression and freedom of association. There's a broad and specialized basket of issues that come up, and I think they should be dealt with by a dedicated oversight body.