The Mongolian People's Front was a resistance faction in Mongolia. At game start, it would control Central Mongolia and would fight against Mengjiang, against whom it was guaranteed to lose.
In the Patch v.1.2.0 "Toolbox Theory", the Mongolian People's Front was removed and its territory transferred to Mengjiang.
History
The Mongolian People's Front was a remnant of the Mongolian People's Republic and a resistance force against Japan's attempts to dominate all of Mongolia. The resistance failed and was defeated by Japan and Mengjiang. Yumjaagiin Tsedenbal was assassinated, all communist parties were dissolved and replaced by the pro-Japanese government of Mengjiang