The Switzerland-based IOC said it does not have direct control over all official products that carry the Olympic label. It said it has created policies on fair labor standards that it expects Olympic host cities and licensed manufacturers to follow.

"The IOC is committed to being a socially responsible leader of the Olympic Movement that takes care of the Olympic brand in the best way possible," IOC spokeswoman Giselle Davies said in a prepared statement. "It matters to us is that sourcing is done ethically."

Davies did not commit to additional monitoring. She said the IOC already works with associations of sporting goods makers and retailers on codes of conduct.

"Licensing of the Olympic brand is a major source of income for the IOC and national Olympic committees," said Guy Ryder, general secretary of the International Trade Union Confederation, a PlayFair campaign member and worldwide union association which is headquartered in Brussels.

"It brings shame on the whole Olympics movement that such severe violations of international labor standards are taking place in Olympic-licensed factories."