Voting out those representatives that allowed flock cameras in their cities.
First you have to vote out all the representatives that voted for the cameras. Then you have ensure the replacements vote to remove them. then you have to be prepared for potentially years of litigation and negative PR campaigns. And that's just on one issue. Many politicians will correctly decide that it's easier to take corporate cash and kiss more babies and get sent back to office anyway.
we need to stop relying on representative democracy. It worked somewhat OK during periods of technological stasis or relatively sedate change, but it's absolutely inadequate to teh challenges of the digital era. Sortition or electronic democracy are the only credible alternatives.