Mikhail Gorbachev major campaign to limit alcohol consumption, which Gorbachev—who believed it would improve health and work efficiency—oversaw. His wife keenly supported the measure. As a result, crime rates fell and life expectancy grew slightly between 1986 and 1987. The reform had significant costs to the Soviet economy, resulting in losses of up to $100 billion between 1985 and 1990. Gorbachev later considered the campaign to have been an error. In April 1986 the Chernobyl disaster occurred; in the immediate aftermath, officials fed Gorbachev incorrect information to downplay the incident. As the scale of the disaster became apparent, 336,000 people were evacuated
Premier of the Soviet Union the Presidium of the Supreme Soviet. The Premier was tasked with resolving all state administrative duties within the jurisdiction of the USSR to the degree which were not the responsibility of the Supreme Soviet or the Presidium. The Premier managed the national economy, formulated the five-year plans and ensured socio-cultural development. When Nikolai Ryzhkov was replaced as premier by Valentin Pavlov, the Council of Ministers was renamed the Cabinet of Ministers. The premier's title was changed to Prime Minister of the Soviet Union, though most non-Soviet sources had referred to the job as "Premier" or "Prime Minister" for some time