Kosher For Work

An interesting story about the Postville plant has conservative rabbis demanding fair treatment of workers in order for food to be kosher.

This is perfectly reasonable and the orthodox rabbis need to have their beards dipped in ink for opposing it.

For food to be kosher, it can not be processed or transported on the Sabbath. The Bible says very specific things about not abusing those who work for you. Shouldn’t that mean that kosher food must be processed in a plant that is safe on workers?