Clement Clay is a very "interesting" character in his own right and has always been under suspicion for playing a role in the Lincoln plotting via the Confederate Cabinet. He would fit in perfectly in the European conflicts of the 1800s because he was a revolutionary at heart and thought nothing of "disposing" of opposition leaders who had a tyrannical streak. Wild Bill and Rick Smith have done some studying of Clay, I believe.
Another son of Alabama that could be mentioned (even though not arrested as part of the Lincoln plot) would be Joseph Pinkney [Pink] Parker, who erected a monument to glorify John Wilkes Booth.
http://southernhistory.blogspot.com/2011...usual.html