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Unions backed a motion urging 'non-compliance and non cooperation' with the Tory Strikes Act, creating a policy of defiance against the legislation passed in July
The Labour leader also came under pressure to repeal all anti-strike laws as his party prepares to unveil its plan for workers' rights.
The TUC argues the government's new strikes legislation is in breach of international law and will escalate industrial tensions rather than resolve them.
The new legislation has already suffered a significant defeat in the High Court.
General secretary Paul Nowak said the TUC will be lodging the case at the International Labour Organisation.