China's main trade union has weighed into the McDonald's and Yum Brands labor dispute, saying that the fast food companies did break the law by underpaying part-time workers in Guangzhou, the Wall Street Journal reported. While the statement from the All China Federation of Trade Unions (ACFTU) doesn't equate to an official decision, the group has strong links with the government. The ACFTU also said it would widen the investigation to other parts of China to see what wages companies pay. Li Jianming, director of international affairs for the labor group, said it would "continue to push the foreign companies to set up trade unions". The situation emerged after reporters from a local newspaper working undercover in McDonald's restaurants, as well as those of Yum-owned KFC and Pizza Hut, claimed that student employees were being paid less than Guangzhou's minimum hourly wage. The companies deny breaking the law.