A Finnish shipping company wanted to move its registration to Estonia. This would allow it to employ cheaper Estonian workers. the ITWU organised a strike against this. They said that Viking was exploiting a flag of convenience.
ECJ had to adjudicate on whether this strike was legal. The CFR says that people have the right to form trades unions and withdraw their labour. Member states are entitled to place limitations on these rights.
The freedom of establishment is a fundamental freedom under the TFEU.
The court found in favour of Viking Abp. The strike would make moving the company to Estonia less advantageous or maybe worthless.
Left wingers said the court favoured big business over workers.