I don’t see why modern surveillance is allowed to bypass these laws in the name of security or w/e goal. When it’s clear investigators have more than enough to work with, just justify it first in court to a justice or judge.

Secret courts are extremely dangerous precedent too and basically defeats the whole purpose.

Civil society outnumbers spooks by how much, and who needs who, who is paying for who? Simply withdrawing support and tax money could end it rather quickly.

I can't tell you how to organize people to do that, but it could actually just happen anytime, just a fluke, everybody wakes up in the morning and thinks enough is enough. High-tech requires constant, expensive maintenance, It's not like, say, a giant stone structure you can leave unattended for a few years or even decades.