A Michigan historical marker to mark the 1936-7 Flint Sit-Downers strike against General Motors is seen in Flint, Michigan in this February 11, 2009 picture. The strike in Flint -- once the heart of GM's empire, with more than 100,000 hourly workers compared with 62,000 hourly workers across the entire company today -- is the stuff of legend in the United Auto Workers union as it spurred on the first contract with an automaker. REUTERS/Rebecca Cook (UNITED STATES)