Liz Truss has been accused of "picking a fight with working people" to distract from Tory failures with plans to tear up key employment rights.
TUC General Secretary France O'Grady told the new Prime Minister "Hands off our hard won rights" - following reports she plans to axe EU protections, including the 48-hour working week.
Unions are even prepared to take the Government to court if Ms Truss shakes up rules to make it more difficult to strike or changes legislation on working hours, sick pay or health and safety issues.