This paper sets forth a preliminary theory of the substructure of Chinese politics. Power is based on an influential constituency in China as elsewhere, but here there are two types of such constituencies: the formal, consisting of an actor's bureaucratic colleagues and subordinates, which exerts formal power [ch'üan-li]; and the informal, consisting of interested family members, long-term friends, and protégés, which exerts informal influence [shih-li]. The support of the former may be relied upon during “nonantagonistic contradictions”; but if the contradiction becomes “antagonistic,” only the informal base is likely to be of any avail, because of the severe sanctions applied to any associate of an “enemy of the people.” The “Gang of Four” could be considered as “favorites” of Mao Tse-tung, inasmuch as their narrow and shallow “backgrounds” afforded them no constituency, formal or informal, aside from the Chairman himself. Their political actions were characterized by exclusive loyalty to their patron and by a disregard for the formal rules of the game. Sensitive to the long-range untenability of their positions, the Four sought to expand their base by appealing to the masses through the media and by building an incipient bureaucratic constituency. Their ultimate failure may be attributed not only to their ineptitude at base-building, but to the inherent limitations of their positions in an increasingly determinate bureaucratic-political game.