Pole here. Only about 10% of workers are in a union. Most of them are in Solidarność which is notoriously a right wing union and a comprador to capitalists and capitalism.

It’s very, very anti communist. And a socdem-ish union like Związkowa Alternatywa is being threatened and attacked by the government constantly, wasting their resources.

So I’d say the figure of truly unionized workers is even lower… not to mention our weak labor laws…