the founding of the Communist regime, with Vladimir Lenin having responsibility, detailing interrogation procedures, prisoner transports, prison camp culture, prisoner uprisings and revolts such as the Kengir uprising, and the practice of internal exile. Soviet and Communist studies historian and archival researcher Stephen G. Wheatcroft wrote that the book was essentially a "literary and political work", and "never claimed to place the camps in a historical or social-scientific quantitative perspective" but that in the case of qualitative estimates, Solzhenitsyn gave his high estimate as he wanted to challenge the Soviet authorities to show that "the scale of the camps was less than this." Historian J. Arch Getty wrote of Solzhenitsyn's methodology that "such documentation is methodically unacceptable in other fields of history", which gives priority to vague hearsay and leads towards selective bias. According to journalist Anne Applebaum, who has made extensive research on the Gulag, The Gulag Archipelago'''s rich and varied authorial voice, its unique weaving together of personal testimony, philosophical analysis, and historical investigation, and its unrelenting indictment of Communist ideology made it one of the most influential books of the 20th century. On 8 August 1971, the KGB allegedly attempted to assassinate Solzhenitsyn using an unknown chemical agent (most likely ricin) with an experimental gel-based delivery method. The attempt left him seriously ill but he survived. Although The Gulag Archipelago was not published in the Soviet Union, it was extensively criticized by the Party-controlled Soviet press. An editorial in Pravda on 14 January 1974 accused Solzhenitsyn of supporting "Hitlerites" and making "excuses for the crimes of the Vlasovites and Bandera gangs." According to the editorial, Solzhenitsyn was "choking with pathological hatred for the country where he was born and grew up, for the socialist system, and for Soviet people." During this period, he was sheltered by the cellist Mstislav Rostropovich, who suffered considerably for his support of Solzhenitsyn and was eventually forced into exile himself. Expulsion from the Soviet Union In a discussion of its options in dealing with Solzhenitsyn, the members of the Politburo considered his arrest and imprisonment and his expulsion to a capitalist country willing to take him. Guided by KGB chief Yuri Andropov, and following a statement from West German Chancellor Willy Brandt that Solzhenitsyn could live and work freely in West Germany, it was decided to deport the writer directly to that country. In the West On 12 February 1974, Solzhenitsyn was