Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A reference; not suitable as the first book to read on the topic

The great purge has too many victims to name, but the author tried to do it anyhow.This certainly seems to be a great reference but it simply should not read by those who do not know the hundreds of minor political characters who, as a general rule, are introduced only in the paragraph where they fall into the purge: 'XXXXX, a general who won the battle of ABC in PQR, was shot only two days after receiving the Order of Lenin.' It simply doesn't illuminate.