Transparency In Institutions
I endorse this idea as well. And I think it could also be expanded -- not just to other animal operations like factory farms, but also to "total institutions" housing humans. The general principle is this: Whenever an instution is given total control over the fate of other sentient beings (that is, beings that can care about their fate), its operations must be open to review by independent parties (outsiders, as well as by its own inmates where feasible). History has shown repeatedly that control combined with a lack of transparency and hence accountability is a recipe for abuse.
The specific solution of video cameras may not work everywhere. It's a good idea for animal institutions, and perhaps for prisons (which are already under potential constant surveilance by guards). Hospitals and nursing homes (and rehabilitation-oriented programs that would ideally replace prisons), on the other hand, would certainly require an alternate means of creating transparency without violating residents' privacy. I recall hearing a few years back that Joe Lieberman had introduced an (unsuccessful) bill to make all prisons, including private ones, subject to strong FOIA rules*, which would have been a small step in the right direction.
*This is the reason I can't quite sign on to the idea that Lieberman is an evil DINO who should just join the Republican Party already. While he's made a fetish of taking a neoconservative position on foreign policy, he gets more liberal the less an issue is in the public spotlight. IIRC he's also a big supporter of DC representation.