Only one of the 4 is not owned by Cargill or JBS.
Unless your beef vendor is taking delivery on whole carcasses and then packing it themselves, the beef is probably packed at the slaughterhouse, as well.
It's illegal to resell beef to consumers which wasn't slaughtered at a facility with a USDA inspector. If you buy the whole animal, like bmj does, then it can be slaughtered by anyone who knows what they're doing and packed (cut and wrapped) by any competent butcher. You then cannot resell that meat (and, in fact, all of the packaging should have not for retail stamps on it).
Now, personally, having actually toured a slaughterhouse (the one in Fresno, CA), I've got no problem with them. I definitely take issue with the "enormous horrible disease-ridden" characterization. Most of the food safety problems have been artifacts of the high volume hamburger production process. If you buy steaks, or even hamburgers made by butchers from whole cuts of meat, you should be in the clear.
I was merely trying to point out, somewhat obliquely, that unless you're slaughtering an animal you own and then buying all of the cut and wrapped meat, any beef you buy in the US was slaughtered at a huge slaughterhouse. That's just the reality of the situation, and it's a combination of regulations intended to keep you safe (having a USDA inspector on site is really, really expensive) and the continued consolidation of the packing industry (enabled by the government, NIMBY organizations, environmental groups, etc).
At the same time, as an Nth generation cattle rancher (where N > 4), I don't want to discourage anyone from buying locally raised beef. ;-)
Of course, the farmer isn't processing an obscene amount of cattle each year, either, and he only sells directly to consumers, face-to-face, so a small butcher can actually handle that sort of volume.
But really, I don't know if the goodness in non-Giant-Eagle meat has anything to do with the meat packing industry. I just was trying to convince ars that food people aren't being totally dumb when they say that local is often better than GEagle equivalents.