The recruitment industry has crticised a part of the Trade Union Bill which would see employers able to bring in agency workers during industrial action, according to the BBC.
Under the government's controversial plans, it would be harder for trade unions to strike. But when they do, they want employers to be able to bring in agency workers to minimise disruption.
Agency workers have been banned since the 1970s. And the Recruitment and Employment Confederation (REC) believes bringing them back would be bad news for agencies, staff and the employers themselves.
Kate Shoesmith, head of policy at the REC, told the BBC: "We are not convinced that putting agencies and temporary workers into the middle of difficult industrial relations situations is a good idea for agencies, workers or their clients."
Our members want to provide the best possible levels of service to their clients, but they also have a duty of care to the workers they send out on assignment," she said.
Ms Shoesmith said it took direction on the matter from its members.
The changes passed their first test in the Commons, winning an initial vote by 33 in favour.