I watch a lot of horror, but one of the legendary movies I've never tracked down is Men Behind the Sun due to its reputation as being quite a slog. That kind of subgenre is not really my thing; I've not watched Ilsa, either. But when you learn that vivisection was involved and that is something that actually happened, it's quite eye-opening.
https://en.wikipedia.org/wiki/Men_Behind_the_Sun
Also, when you learn of actual cannibalism - watch this until the end for the mind-blowing twist:
If you don't want Medicaid cuts, you should not vote for any Republican, ever.