The established literature has recognized revolving-door hiring as a means for firms to obtain protection against political risks and advance their business interests. This article theorizes about the cost of the revolving door between politics and business, which transmits uncertainty during turbulent times from the political system to firms. I empirically estimate the cost of revolving-door recruitment for over 3,000 publicly listed firms in the early years of a major corruption crackdown in China. I show that firm-level returns on revolving-door recruitment became negative during this period. In contrast to conventional corporate governance explanations, the mechanism proposed in this article emphasizes the external perceptions and financing of firms. Text analyses of over 1 million equity reports and bank-loan record data show that political connections act as a negative signal to external financiers, thereby discouraging external financing.