The paper examines the role of testosterone-driven aggressive behavior in politics of non-democratic regimes and, in particular, its influence on the extent of the repressiveness of these regimes. To measure testosterone exposure, we apply the facial width-to-height metric (fWHR) – a standard proxy widely used in the psychological literature - and look at a sample of Russian regional governors. We find a positive relationship between the fWHR metric and the level of repression in the region of the governor. Testosterone-related behavior is, however, more widespread among younger governors and among governors with shorter tenure in office. Thus, the paper contributes to the recent trend of integrating insights of behavioral economics into political economics research.