第4野戦軍
In July 1949, the CMC decided to establish the MPS with Luo Ruiqing as its minister to organize the public security forces in the nation. In August 1949, several security and public order units of the Fourth Field Army were consolidated into the Central Column of the Chinese People's Public Security Force (PSF) to guard the Party and State leaders and to keep the public order in the capital. The Central Column provided security for the inauguration ceremony of the People's Republic. From December 1949 to May 1950, regional security forces, along with the now dissolved Central Column, had been consolidated into divisions under the PSF.