(Reuters) – Volkswagen’s top labor representative threatened on Wednesday to try to block further investments by the German carmaker in the southern United States if its workers there are not unionized.

Workers at VW’s factory in Chattanooga, Tennessee, last Friday voted against representation by the United Auto Workers union (UAW), rejecting efforts by VW representatives to set up a German-style works council at the plant.

German workers enjoy considerable influence over company decisions under the legally enshrined “co-determination” principle which is anathema to many politicians in the U.S. who see organized labor as a threat to profits and job growth.

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