For the past week, not a single Tesla has passed through Sweden’s four biggest ports. Starting Friday, broken Superchargers won’t get repaired. Next week, parts deliveries to repair shops and garbage pickups will stop.

Such are the repercussions of Swedish unions flexing their muscles against the world’s biggest electric-car company. While the effects of a strike at Tesla Inc.’s seven repair shops in the country are a far cry from what could come of efforts to unionize factories in Germany and the US, they’re indicative of how powerful and pervasive labor groups are in an important market for Elon Musk.