and the early 1980s, adult mortality began to improve again. 218 The general tendency of this period was an increase in religious activity among believers of all faiths. Under Yuri Andropov, KGB chairman in and General Secretary from 1982 to 1984, the KGB engaged in the suppression of political dissent and maintained an extensive network of informers, reasserting itself as a political actor to some extent independent of the party-state structure, 122 culminating. A long and bloody Civil War ensued between the Reds and the Whites, starting in 1917 and ending in 1923 with the Reds' victory. Issn Nikos Marantzidis, "The Greek Civil War (19441949) and the International Communist System." Journal of Cold War Studies.4 (2013 2554. In 1956 he denounced Stalin's use of repression and proceeded to ease controls over party and society. By gradually consolidating his influence and isolating and outmaneuvering his rivals within the party, Stalin became the undisputed leader of the Soviet Union and, by the end of the 1920s, established totalitarian rule. Fearing its ambitions, the Soviet Union's wartime allies, the United Kingdom and the United States, became its enemies.