a Cheka department stated: Estimates suggest that during the suppression of the Tambov Rebellion of 1920–1921, around 100,000 peasant rebels and their families were imprisoned or deported and perhaps 15,000 executed. This campaign marked the beginning of the Gulag, and some scholars have estimated that 70,000 were imprisoned by September 1921 (this number excludes those in several camps in regions that were in revolt, such as Tambov). Conditions in these camps led to high mortality rates, and "repeated massacres" took place. The Cheka at the Kholmogory camp adopted the practice of drowning bound prisoners in the nearby Dvina river. Occasionally, entire prisons were "emptied" of inmates via mass shootings prior to abandoning a town to White forces. Industrial workers On 16 March 1919, Cheka stormed the Putilov factory. More than 900 workers who went to a strike were arrested, of whom more than 200 were executed without trial during the next few days. Numerous strikes took place in the spring of 1919 in cities of Tula, Oryol, Tver, Ivanovo and Astrakhan. Starving workers sought to obtain food rations matching those of Red Army soldiers. They also demanded the elimination of privileges for Bolsheviks, freedom of the press, and free elections. The Cheka mercilessly suppressed all strikes, using arrests and executions. In the city of Astrakhan, a revolt led by the White Guard forces broke out. In preparing this revolt, the Whites managed to smuggle more than 3000 rifles and machine guns into the city. The leaders of the plot decided to act on the night 9–10 March 1919. The rebels were joined by wealthy peasants from the villages, which suppressed the Committees of the Poor, and committed massacres against rural activists. Eyewitnesses reported atrocities in villages such as Ivanchug, Chagan, Karalat. In response, Soviet forces led by Kirov undertook to suppress this revolt in the villages, and together with the Committees of the Poor restored Soviet power. The revolt in Astrakhan was brought under control by 10 March, and completely defeated by the 12th. More than 184 were sentenced to death, including monarchists, and representatives of the Kadets, Left-Socialist Revolutionaries, repeat offenders, and persons shown to have links with British and American intelligence services. The opposition media with political opponents like Chernov, and Melgunov, and others would later say that between 2,000 and 4,000 were shot or drowned from 12 to 14 of March 1919. However, strikes continued. Lenin had