A number of Unionist leaders in east Tennessee were also slave-owners. Andrew Johnson comes to mind right away. Johnson got Lincoln to exempt Tennessee from the EP while he was Military Governor. I believe U.S. Congressman Horace Maynard almost changed sides over the issue. Parson Brownlow hated abolitionists as much as Confederates. He claimed the "institution", could be better protected under the U.S. Constitution, rather then the Confederacy. Now they all eventually changed, when it became apparent the North would win.