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Jeremy Corbyn’s leadership campaign group have cancelled orders of branded T-shirts after it was revealed they were made in sweatshops in Bangladesh.

The T-shirts, branded with the politician’s name, were being made by workers earning just 30p per hour, The Mail on Sunday reported.

They were ordered by Mr Corbyn’s campaign group Momentum and were sold at £10 each to make money for the leadership battle.

The Mail on Sunday said that it found machinists living in poverty-stricken conditions and working 10 hours-a day on the T-shirts.

Momentum announced it had cancelled the contract, suggesting it may have been misled by suppliers about the labour practices at the factory.

However, the newspaper said the factory was owned by the same firm which was revealed to have paid workers 49p an hour to make the official Team Corbyn T-shirts for his first Labour leadership bid.

Mr Corbyn’s campaign group said it wanted to ensure a zero-tolerance policy on unethical practices anywhere in the supply chain and would be seeking a new supplier with full ethical standards.

The group said it would draw up a code of practice capable of maintaining confidence that all campaign materials have been produced by businesses that respect labour rights and human rights.

A spokesman said: "Momentum is dedicated to championing people's rights at work both at home and overseas.

"We want every worker at home and abroad to be in a trade union, and to enjoy the full protections that the ILO (International Labour Organisation) recommends as minimum standards.

“We refuse to work with any supplier who does not uphold these standards."

The Mail on Sunday reported that the basic salary at the factory in Baipayl, near the capital Dhaka, was around £63 a month - well below the average wage in Bangladesh of £93.

Employees were said to live in shanty towns made of corrugated iron sheets by a polluted river with several family members sleeping together in cramped rooms.