https://www.propublica.org/search?qss=meatpacking
I'm not sure if ProPublica has a free, public dataset on meatpacking plants but they generally have datasets that you can purchase that pertain to particular areas of reporting: Medicare and Medicaid overbilling / fraud; repeated pollution violators who keep paying fines instead of stopping polluting; etc. If anyone knows of a dataset on meatpacking plants, health and/or safety violations, etc. please do share the link to the dataset.
The argument that more pay & benefits for these workers will make meat more expensive is also nothing but a scare tactic. There is already so much automation that the increased cost will hardly be noticeable when it is distributed among purchasing units at the consumer end.
John Oliver covered this two years ago: https://youtu.be/IhO1FcjDMV4