The Supreme People's Procuratorate and the All-China Federation of Trade Unions jointly issued a notice to promote the eradication of wage arrears and other issues. The "one letter, two letters" system is the abbreviation of the system for labor unions and relevant units to apply relevant documents to remind employers to implement labor laws and regulations.

This system focuses on prevention at the source, and aims to resolve labor relations conflicts and disputes at the grassroots level through coordination and consultation, and to resolve them in the bud.