Unions had their place and their time. They did a lot of good for the working man. However, their time has passed due to laws to protect workers (OSHA, etc) and their own corruption.
SC is a right to work state, so a union can't come into the facility and "take over." Most of the south is this way, which is why BMW, Mercedes-Benz, Toyota, Hyundai and Kia all have manufacturing facilities here (and that's just the ones I can think of off the top of my head). "Right to Organize" laws (which basically allow unions to take over a facility and require membership to work there) have killed the northeast.