The labor conflict against Tesla in Sweden is spreading to neighboring Denmark where transport workers with the country’s largest trade union said Tuesday they will take action in solidarity with Swedish workers against the Texas-based automaker.

Tesla is non-unionized globally, but the Swedish workers are demanding that the carmaker sign a collective bargaining agreement, which most employees in Sweden have. Tesla has no manufacturing plant in Sweden but has several service centers.

The United Federation of Workers in Denmark, known in Danish as 3F, said there had been speculation that Tesla would deliver its cars to Danish ports and transport them on trucks to Sweden after Swedish dock workers blocked the reception of Tesla cars there.