The blockade, which began on March 28, means that the members of the Port Workers' Union do not work with Russian ships, Russian goods and ships on their way to or from Russia.
According to the union, the blockade is a measure of sympathy for the Ukrainian dock workers.
Illegal combat action
The employer side, however, believes that the industrial action is illegal and already last week threatened with legal action.
The Port Workers' Union has now been sued, the union states in a press release.
"At the same time as other large Swedish companies such as Volvo, Scania, Ikea and SKF on their own initiative withdraw from business relations with Russia, the port employers go to court to try to force our members to release Russian raw materials that can finance the Russian invasion of Ukraine.
It actually feels completely unreal, "says the union's chairman Martin Berg in the press release.
Taken up on Friday
Håkan Filipsson, press officer at the Ports of Sweden, confirms that the case has been passed on to the Labor Court, where it will be taken up on Friday.
“The peace obligation that follows from the collective agreement is a fundamental cornerstone of the Swedish model.
It is therefore not a viable way to ignore current regulations in the event of war or conflict, "said Johan Grauers, chief negotiator at the Ports of Sweden, in a written comment last week.