Tesla Inc. is coming under increased pressure in Sweden after a union for transport workers said it planned to extend its blockade of the automaker’s shipments to every Swedish port, starting Nov. 17.

The Swedish Transport Workers’ Union had earlier announced it would refuse to load and unload Tesla cars in four Swedish ports following the U.S. company’s refusal to sign collective labor agreements with its mechanics. IF Metall members working in 10 Tesla services shops and roughly 20 repair centers have been striking since Oct. 27.