RISHI Sunak is poised to announce a new law to enforce “minimum service” levels across sectors such as rail, health, education, fire and border security.
Sources said strikes would be deemed illegal if unions refused to provide an agreed level of service.
It would mean employers could sue unions.
And members of trade unions who were ordered to work but declined could be dismissed from their jobs.
Trade unions could take legal action against the moves.
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It comes as train bosses claim rail strikes have now cost union members more in lost pay than any boost from a potential pay rise.
On-board ticket inspectors and train guards on £30,000 salaries will have lost around £2,000 if they have taken part in every strike day.
The warning comes as Aslef train drivers walk out today and Mick Lynch’s RMT members prepare for a 48-hour walkout from tomorrow.
Network Rail’s chief negotiator Tim Shoveller said: “A lot of our employees have lost huge amounts of money from strikes — more than they could possibly earn back from a pay rise.”