During the so-called "Reign of Terror" of Macías Nguema, the dictator suppressed much of the intelligentsia of the country, initiating the process of taking over the positions of the public administration by part of the natives of Mongomo and clan Esangui. Many city residents had to leave. In the last years of his mandate, almost a fifth of the population fled. At that time (1968–1979), Equatorial Guinea received money from the Soviet Union in return for, inter alia, affording port facilities for Soviet naval craft, particularly submarines.