These images were all used (along with lots of others) in a 2003 campaign in which PETA, obviously, compared modern agricultural practices and eating meat with the Holocaust:
I assume it will not surprise anyone to learn that many people were offended by the campaign. I can imagine using these images in courses on food/agriculture, social movements, natural resources and the environment (especially in discussions of what rights non-human animals have), and even lectures about historical memory (for instance, when and how does it become acceptable to use historical tragedies like the Holocaust as symbols in other arguments, rather than as events in and of themselves?).
Thanks to an anonymous poster for pointing this campaign out!
The ad references an incident on a bus in Manitoba where a man beheaded a fellow passenger and compares it to the slaughtering of animals.