Sportswear firms have been accused of exploiting workers in a bid to get products onto shop shelves in time for the Athens Olympics in August.
Oxfam and UK trade unions said the companies were overriding labour standards and treating workers badly.
The accusations are based on interviews with workers and management in China, Bulgaria, Turkey, Thailand, Cambodia and Indonesia.
Here are some of the comments made by those interviewed.
Phan, 22, migrant worker in a Thai garment factory