If I were a genious I would have known. I do know there are unions in the south. I worked at an amuminum mill in the South and had to contend with a tough Steel Workers Union.
A little education is a dangerous thing as evidenced by some of the posters here...
http://www.unions.org/union_search.php?&abbr=&abbr_key=&bizcat=0&zip=birmingham,%20al&local=&zip_key=
Birmingham has a union for just about anything you want.