Sergey Prokudin-Gorsky
Sergey Mikhaylovich Prokudin-Gorsky (, ;  – September 27, 1944) was a Russian chemist and photographer. He is best known for his pioneering work in colour photography and his effort to document early 20th-century Russia.
Maxim Gorky
Gorky was active with the emerging Marxist social-democratic movement. He publicly opposed the Tsarist regime, and for a time closely associated himself with Vladimir Lenin and Alexander Bogdanov's Bolshevik wing of the party, but later became a bitter critic of Lenin as an overly ambitious, cruel and power-hungry potentate who tolerated no challenge to his authority. For a significant part of his life, he was exiled from Russia and later the Soviet Union. In 1932, he returned to the USSR on Joseph Stalin's personal invitation and lived there until his death in June 1936.