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.
GRU (G.U.)
The tenure of Sergun′s successor, Igor Korobov, was marked by what was construed by the news media as multiple high-profile failures such as the thwarted 2016 coup d'état attempt in Montenegro and the failed 2018 Salisbury poisoning, as well as an unprecedented number of disclosed GRU agents. Korobov died on 21 November 2018, "after a serious and prolonged illness", according to the official defence ministry′s statement. His death provoked speculations and unverified reports of him having fallen ill in October that year, following a harsh dressing-down from president Vladimir Putin. However, former CIA station chief Daniel Hoffman, cautioned in 2017 that some of the Russian intelligence′s recent operations that appeared to be botched might have been ″discoverable influence operations″, i.e. operations that were meant to be discovered.