The Communist camp is composed of twelve states: the Soviet Union, China, Poland, Czechoslovakia, East Germany, Rumania, Hungary, Bulgaria, North Korea, North Vietnam, Albania, Mongolia. Jointly, the Communist-ruled states account for about 38 per cent of the world's population, 24.2 per cent of the world's area, and approximately one-third of the world's industrial output. During Stalin's lifetime the Communist bloc operated essentially through a relatively simple subordination of the various units to the dictator's will, generally expressed by indirect methods of police and party control. This somewhat informal organization reflected in part the old dictator's specific political style; in part it was a function of the relatively immature stage of the bloc's development. As a result, the “maturation” of the bloc coincided with the difficult post-Stalin period of transition within the USSR and was marked by major upheavals and tensions. By 1958-1959, however, the crisis had subsided, and a new and more complex image of the bloc became apparent. While the Soviet Union continued to exercise leadership, acknowledged at the November 1957 conference of the Communist parties and buttressed by Soviet international and technological prestige, the camp had developed more elaborate mechanisms and processes of cohesion that also contributed to its unity. Some of them dated back to the Stalinist days, but were now infused with new vitality. Others emerged during the post-Stalin phase.