Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A good thumbnail sketch of the oligarchic interregnum

Daniel Hoffman of the Washington Post has written a good introduction to the interregnum between the reign of the Commununist Party of the USSR and the Presidency of Vladimir Vladimirovich Putin. When Communism and the Russian legal system collapsed, the boldest and brashest quickly amassed fortunes in rather unusual circumstances.Hoffmann's account is a good introduction to these times and to the "oligarchs" who shaped these times. His book is by no means a work of investigative reporting, being liberally littered with phrases along the lines of "we'll never know the whole story", "there must have been more going on, but there are no authorative sources," "we can only surmise that much of the episode is opaque." Nor do I understand why Hoffman considers mayor Luzhkov of Moscow, Moscow's answer to Richard Joseph Daley of Chicago, an "oligarch."All the same, this is a well-written and entertaining book about an extraordinary time.