there were also non-Russian leaders in the Soviet leadership, such as Joseph Stalin, Grigory Zinoviev, Nikolai Podgorny or Andrei Gromyko. During the Soviet era, a significant number of ethnic Russians and Ukrainians migrated to other Soviet republics, and many of them settled there. According to the last census in 1989, the Russian ‘diaspora’ in the Soviet republics had reached 25 million. Health In 1917, before the revolution, health conditions were significantly behind those of developed countries. As Lenin later noted, ‘Either the lice will defeat socialism, or socialism will defeat the lice’. The Soviet principle of health care was conceived by the People's Commissariat for Health in 1918. Health care was to be controlled by the state and would be provided to its citizens free of charge, a revolutionary concept at the time. Article 42 of the 1977 Soviet Constitution gave all citizens the right to health protection and free access to any health institutions in the USSR. Before Leonid Brezhnev became general secretary, the Soviet healthcare system was held in high esteem by many foreign specialists. This changed, however, from Brezhnev's accession and Mikhail Gorbachev's tenure as leader, during which the health care system was heavily criticized for many basic faults, such as the quality of service and the unevenness in its provision. Minister of Health Yevgeniy Chazov, during the 19th Congress of the Communist Party of the Soviet Union, while highlighting such successes as having the most doctors and hospitals in the world, recognized the system's areas for improvement and felt that billions of rubles were squandered. After the revolution, life expectancy for all age groups went up. This statistic in itself was seen by some that the socialist system was superior to the capitalist system. These improvements continued into the 1960s when statistics indicated that the life expectancy briefly surpassed that of the United States. Life expectancy started to decline in the 1970s, possibly because of alcohol abuse. At the same time, infant mortality began to rise. After 1974, the government stopped publishing statistics on the matter. This trend can be partly explained by the number of pregnancies rising drastically in the Asian part of the country where infant mortality was the highest while declining markedly in the more developed European part of the Soviet Union. Dentistry Soviet dental technology and dental health were considered notoriously bad. In 1991, the average 35-year-old had 12 to 14 cavities,