Well it's in your question it was the North of America, the people who didn't like slaves and thought the south was wrong. Everything term you used is considered for the North of America during the American Civil War.
No They Did Not Treat Them fairly
The compromises were reached concerning enslaved people were The Northern states <span>had already banned the slave trade. They wanted to prohibit it nationwide.</span>
I would say the answer is a civil case. Those usually deal with contracts and torts.