However, the plant at Spring Hill Saturn is union, United Auto Workers Local 1853.
Not at the end of the month, it ain't.
Right. The law doesn't forbid unions but it forbids closed shops—compulsory union membership for workers in unionized shops.
This decision to idle Springhill is based on partisan politics and Soviet-style central planning. Michigan is seen as in more dire need of jobs than Tennessee. GM just finished an almost $1 billion retooling of Springhill.
Now they will spend another billion for the same reconfiguration of the Michigan plant.
http://www.knoxnews.com/news/2009/jun/27/spring-hills-hopes-dashed/