The SEIU is the largest single labor union in North America, with a membership nearing 1.9 million members and is part of the new Change to Win (CTW) labor federation. Primarily, SEIU represents public service, property service, and healthcare workers and is one of the few unions in the United States that is growing. Local 205 is chartered to represent workers in Tennessee, including our chapters in Nashville, Chattanooga, Oak Ridge, and Memphis.