Vorkuta "Rechlag" (River Camp) or Special Camp No. 6 consisted of 17 separate "departments" engaged in construction of coal mines, coal mining and forestry. In 1946 it housed 62,700 inmates, 56,000 in July 1953. A substantial portion of the camp guards were former convicts. According to Aleksandr Solzhenitsyn, the uprising was provoked by two unconnected events of June 1953: the arrest of Lavrentiy Beria in Moscow and the arrival of Ukrainian prisoners who, unlike long-term Russian inmates, were still missing their freedom (similar dissent existed between Baltic - the second largest group - and Polish inmates). Another major factor was the application of the March 1953 general amnesty, issued after the death of Joseph Stalin, to only convicts with criminal sentences and small prison terms, of which there were few in Vorkuta, as a large part of the inmates were political prisoners.