The Great Purge, or the Great Terror, also known as the Year of '37 and the Yezhovshchina, was Soviet General Secretary Joseph Stalin's campaign to consolidate power over the Communist Party of the Soviet Union and Soviet state. The purges also sought to remove the remaining influence of Leon Trotsky. The term great purge, an allusion to the French Revolution's Reign of Terror, was popularized by the historian Robert Conquest in his 1968 book The Great Terror.

The Great Terror: Stalin's Purge of the Thirties is a book by British historian Robert Conquest which was published in 1968. It gave rise to an alternate title of the period in Soviet history known as the Great Purge. Conquest's title was also an evocative allusion to the period that was called the Reign of Terror during the French Revolution. A revised version of the book, called The Great Terror: A Reassessment, was printed in 1990 after Conquest was able to amend the text, having consulted the opened Soviet archives. The book was funded and widely disseminated by Information Research Department, who also published Orwell's list collected by Conquest's secretary Celia Kirwan.