The All-China Federation of Trade Unions (ACFTU) is the national trade union center of the People's Republic of China. It is the largest trade union in the world with 302 million members in 1,713,000 primary trade union organizations. The ACFTU is divided into 31 regional federations and 10 national industrial unions. The ACFTU is the country's sole legally mandated trade union, with which all enterprise-level trade unions must be affiliated. There has been dispute over whether ACFTU is an independent trade union or even a trade union at all. It directs a public college, the China University of Labor Relations.