How does domestic surveillance affect the frequency of political imprisonments in autocratic states? In contrast to conventional wisdom, I argue that surveillance reduces the frequency of political imprisonments in power-maximizing autocracies. Surveillance decreases uncertainty about the correct targets of repression, allowing for more selective detentions and shifts to silent instruments of repression. To investigate these claims, I draw on a unique county-level dataset of political imprisonment in the German Democratic Republic between 1984 and 1988. I proxy the number of monitored individuals with newly collected county-level data on surveillance operations. I use ordinary least squares (OLS) regression, random effects, and instrumental variable models to investigate the impact of surveillance on political imprisonment. I find that higher shares of spies per monitored individual were associated with a reduction of political imprisonment. Further, increasing levels of spy infiltration were linked to a systematic shift to silent instruments of repression.