[1] According to a book review in The New York Times in January 2015: The Northwest Ordinance of July 1787 held that slaves "may be lawfully reclaimed" from free states and territories, and soon after, a fugitive slave clause — Article IV, Section 2 — was woven into the Constitution at the insistence of the Southern delegates, leading South Carolina's Charles Cotesworth Pinckney to boast, "We have obtained a right to recover our slaves in whatever part of America they may take refuge, which is a right we had not before.
"[2]The meaning of the Extradition Clause was first tested before the Supreme Court in the case of Kentucky v. Dennison (1861).
The case involved a man named Willis Lago who was wanted in Kentucky for helping a slave girl escape.
The case involved an Iowan, Ronald Calder, who struck a married couple near Aguadilla, Puerto Rico.
The Court rejected it, ruling that, under Kentucky v. Dennison, the Governor of Iowa was not obligated to return Calder.