Having written off more than a decade of futile efforts to organize workers at non-union Japanese automobile assembly plants in the United States, the United Auto Workers union will try to organize workers at the two newest plants operated by German automakers Mercedes-Benz and BMW. The effort is expected to begin after the UAW's annual convention in June. BMW has about 2,000 workers at its plant near Spartanburg, SC, and Mercedes employs about 1,000 people in Vance, AL.