books.google.ca - Finkelman describes the judicial turmoil that ensued when slaves were taken into free states, and the resultant issues of the conflict of laws, comity and cooperation between the states, their Constitutional obligations, and the threat of nationalization of slavery....http://books.google.ca/books/about/An_Imperfect_Union.html?id=1jcTdMLJICcC&utm_source=gb-gplus-shareAn Imperfect Union
