It is highly doubtful that any one of these lads owned a slave. He would have been lucky to own his own horse, and to feed it, and feed himself, let alone feed "slaves".
What threat does this cemetery pose to anyone? It's a fact. it happened. A descriptive marker does not amount to advocacy. Shame on the people of Wisconsin who allow this mockery of truth. Sorry to those who have to live there under this sort of tyranny.
Compare their character to that of the Mayor.
This is evil in its purest form.