A grass roots group which supports Jeremy Corbyn is to "rigorously" check the sourcing of merchandise after saying it may have been misled by a supplier.
Momentum said it wanted to ensure a zero-tolerance policy on unethical practices anywhere in the supply chain.
The move has been taken after allegations surfaced that Momentum and one of its suppliers may have been misled by a third party supplier in relation to its labour practices.
The order placed with the company has been cancelled and a new supplier sought with full ethical standards.
Momentum said it will draw up a code of practice capable of maintaining confidence, in spite of the complexity of modern supply chains, 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 recommends as minimum standards. We refuse to work with any supplier who does not uphold these standards."