The term “repression” was officially used to denote the prosecution of people considered as anti-revolutionaries and enemies of the people. The purge was motivated by the desire on the part of the leadership to remove dissident elements from the Party and what is often considered to have been a desire to consolidate the authority of Joseph Stalin. Additional campaigns of repression were carried on against social groups which were believed, or at least were accused, for ulterior political motives, to have opposed the Soviet state and the politics of the Communist Party.
Also, a number of purges were officially explained as an elimination of the possibilities of sabotage and espionage, in view of an expected war with Germany. Most public attention was focused on the purge of the leadership of the Communist Party itself, as well as of government bureaucrats and leaders of the armed forces, the vast majority being Party members.
However, the campaigns affected many other categories of the society: intelligentsia, peasants and especially those branded as “too rich for a peasant” (kulaks), and professionals. A series of NKVD (the Soviet secret police) operations affected a number of national minorities, accused of being “fifth column” communities.
According to Khrushchev’s 1956 speech, On the Personality Cult and its Consequences and more recent findings, many of the accusations, including those presented at Moscow show trials, were based on forced confessions and on loose interpretations of Article 58 (RSFSR Penal Code), which dealt with counter-revolutionary crimes. Due legal process, as defined by the Soviet law in force at the time, was often largely replaced with summary proceedings by NKVD troikas.
These purge quotas were met with the deaths of millions of people. Several hundreds of thousands were executed by shooting and millions were forcibly resettled. Many were imprisoned and tortured or sent to labor camps, both functioning as part of the GULAG system. Many died at the labor camps due to starvation, disease, exposure and overwork. The Great Purge was started under the NKVD chief Genrikh Yagoda, but the height of the campaigns occurred while the NKVD was headed by Nikolai Yezhov, from September 1936 to August 1938; this period is sometimes referred to as the Yezhovshchina (“Yezhov era”). However the campaigns were carried out according to the general line, and often by direct orders, of the Party Politburo headed by Stalin.
Large-scale politically motivated killing of this type gave rise to modern terms, such as “democide” and “politicide”.