The Slaughterhouse Cases was as a result of an 1869 Louisiana legislation that granted the monopoly of the slaughtering business to one corporation, which led to a court suit by other slaughterhouses that said that such legislation infringed on their privileges as American businessmen.
The case was lost by a five-to-four majority stating that states retained jurisdiction over citizens and federal rights did not extend to the property rights of the aggrieved.
The problem that this brought was that cities were not able to control businesses.