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Sergey Gennadiyevich Nechayev was a Russian anarcho-communist, part of the Russian nihilist movement, known for his single-minded pursuit of revolution by any means necessary, including revolutionary terror. Nechayev fled Russia in 1869 after having been involved in the murder of a former comrade—Ivan Ivanov, who disagreed with some actions of Nechayervites. Complicated relationships with fellow revolutionaries caused him to be expelled from the International Workingmen's Association. Arrested in Switzerland in 1872, he was extradited back to Russia where he received a twenty-year sentence and died in prison.