The CT ACLU was also strongly opposed. There was also concern about the shadiness of the private companies selling and installing the cameras, particularly what agencies they’d release the footage to, like ICE. New Haven got city IDs in the late 2010s, so immigrants could have basic ID so they could get a bank account and not be a target for mugging. ICE retaliated by targeting New Haven for immigration roundups. So the question of public surveillance was (and still is) a big concern.

Eta: ACLU was concerned about due diligence, fairness, and privacy. I’m not sure if their stance had changed.

https://www.acluct.org/en/press-releases/traffic-light-cameras-still-a-bad-idea