US workers for plants owned by Taiwan's Koo's Group are angry and they have brought their grievances across the Pacific to Koo's doorstep - Hundreds of labor and environmental activists from 16 countries yesterday protested in front of the Taiwan Cement Corp building in Taipei to urge the Koo's Group to solve disputes involving one of its subsidiaries in the US. The protesters claim that Koo's Group's Continental Carbon Co violated environmental protection and labor rights laws [in USA]