An Equal Employment Opportunity Commission lawsuit filed last week accuses a South Georgia farmer of discriminating against U.S. and black workers because of their race and national origin while giving better treatment to workers from Mexico.  The suit alleges that the firm in 2009 let go the bulk of its U.S. workers but kept nearly all of its 370 workers from Mexico. The next year, lawyers say the company terminated the majority of its 233 U.S. workers, but it kept the vast majority of its 518 workers from Mexico.