Who is Anatoly Ilyich Fastenko from The Gulag Archipelago, 1918-1956 and what is their importance?

Solzhenitsyn's cellmate in Lubyanka Prison Cell 67 and later 53, Fastenko is a youthful 63 years old with lively eyebrows, a keeper of the old prison traditions and revolutions. He puts things in perspective. He is first sentenced in 1904 but freed under the manifesto of 17 Oct. 1905, which he recalls brings riots of joy and the warden's humanity. In 1906, Fastenko is sentenced to four years in Sevastopol Central Prison in irons and four years in exile. He travels, including to Paris, where he works with Lenin and Lunacharsky, Canada, and the U.S., before heading home after the Revolution. After the Revolution, he works for Pravda and in the Moscow City Planning Office rather than the important positions his underground exploits deserve.