In 1974, after 4 years of living in West Germany, he was stripped of his Soviet citizenship (restored in 1990) and worked with the Forschungsinstitut für Sowjetische Gegenwart (Research Institute for the Soviet Union).
His book Secrets Revealed: Moscow Archives Speak sketches the role of terror in the Soviet system, the evolution of the Soviet secret police, and the role of the nomenklatura in its hierarchy.
Michael Voslensky (1984). Nomenklatura: Anatomy of the Soviet Ruling Class (1st ed.). The Bodley Head Ltd, London. ISBN0-370-30471-3.
Russian original was written in 1970, distributed by samizdat, and eventually printed as Восленский М.С., Номенклатура. Господствующий класс Советского Союза. М., 1991.
German: Nomenklatura : der herrschende Klasse der Sowjetunion