Despite Stalin's death, the massive police apparatus headed by the Securitate (created in 1949 and rapidly growing in numbers) maintained a steady pace in its suppression of"class enemies", until as late as 1962–1964. In 1962–1964, the party leadership approved a mass amnesty, extended to, among other prisoners, ca. 6,700 guilty of political crimes. This marked a toning down in the violence and scale of repression, after almost twenty years during which the Party had acted against political opposition and active anti-communist resistance, as well as against religious institutions (most notably, the Romanian Roman Catholic and Greek-Catholic Churches). Estimates for the total number of victims in the 1947/1948-1964 period vary significantly: as low as 160,000 or 282,000 political prisoners, and as high 600,000 (according to one estimate, about 190,000 people were killed or died in custody— ). Notorious penal facilities of the time included the Danube-Black Sea Canal, Sighet, Gherla, Aiud, Pitești, and Râmnicu Sărat; another method of punishment was deportation to the inhospitable Bărăgan Plain.