The leaders of authoritarian regimes often invoke nationalist themes to garner support from their populations. However, negative experiences with the regime may effectively inoculate individuals against nationalist campaigns, reducing the ability of the regime to sway public opinion. In this paper, we study the long-term effects of mobilization and repression on nationalist attitudes. We exploit a discontinuity in exposure to a student movement, by comparing alumni who were in college and on campus during the movement with alumni who only enrolled after the movement was suppressed. We find that alumni who were in college during the movement are substantially less nationalistic than those who enrolled shortly thereafter. Our findings are consistent across a range of specifications and show that exposure to mass mobilization and state repression is associated with lower support for nationalism. These differences are observable more than twenty-five years later, despite sustained state censorship.