The California automaker Tesla would like to build more of its direct-to-consumer dealerships in New York. Legislation that would allow it to do so has received bipartisan support this session.

But the Tesla bill has also drawn a surprising foe — the United Auto Workers union. What makes the union’s opposition so shocking? At the same time UAW is trying to halt Tesla’s car sales, it’s actively working to get the Tesla employees who build those cars to join its ranks.