The Public Service Association says a proposed change to strike laws would fundamentally change industrial relations

Tens of thousands of workers across education and health are expected to stop work on Thursday.

Health Minister Simeon Brown has suggested a law change to prevent workers in life services from striking.

PSA National Secretary Fleur Fitzsimons says there's already a huge power imbalance between employers and workers.

She says the right to strike is crucial - and shouldn't be taken away.