We keep the names of the places as they were in the year of events described e.g. Igor Pavlov was born in Leningrad and he now lives in St. Petersburg.
The Dyatlov group was from Sverdlovsk, which was the name of Yekaterinburg from 1924 to 1991.

Party organizer (secretary) at an institution, factory – partorg
Komsomol organizer (secretary) at an institution, factory – komsorg
Labor union organizer (secretary) at an institution, factory – proforg

party/Komsomol/labor union/sport district committee – raycom (rayonniy komitet)
party/Komsomol/labor union/sport city committee – gorcom (gorodskoy komitet)
party/Komsomol/labor union/sport regional committee – obcom (oblastnoy komitet)

UPI labor union committee – profcom (profsoyuzniy komitet)

For the Soviets (Soviet quasi legislative/executive bodies):
     raysovet - district soviet
     gorsovet - city soviet
     oblsovet - regional soviet

For the Soviet executive bodies:
     ispolcom raysoveta - district soviet executive committee
     ispolcom gorsoveta - city soviet executive committee
     ispolcom oblsoveta (oblispolcom) - regional soviet executive committee

Until 1928 Russia had Governorates, later replaced with: район, област = district, округ = region, край = territory.

Soviet secret classifications of the level of secrecy:
Secret [Sekretno]
Top Secret [Sovershenno Sekretno]
Top Secret [Sovershenno Secretno] / Copy to be destroyed [Копии подлежат уничтожению]
Top Secret, Special File [Совершенно Секретно: Особая Папка]
The latter files were kept separate from the rest, their declassification periods are 50 years and up. There were Stalin, Molotov, Beria, later Khrushchev Special Files, as well -- Politburo Special Files.

Agitprop trek	Agitprop propaganda trek (агитпоход)
ASGM-25	Airborne prospecting system device (АСГМ-25)
ASSR	Autonomous Soviet Socialist Republic
AO ZSU GVF	Western Siberian Office of Civil Aviation (АО ЗСТУ ГВФ)
Case officer	The Soviet/Russian militia/police/MVD/KGB term оперуполномоченный "operupolnomochenniy" (authorized operative) may be rendered into English as a special agent, since the responsibilities in that office were similar to the FBI’s SA (Special Agent). A more authentic alternative is case officer e.g. of the Ivdel city Militia station. In some contexts it could also be translated as investigator.
Glavspetslesprom	Main Special Directorate of the Forest Industry (Главное специальное управление лесной промышленности МВД - Главспецлеспром)
GRES	Hydroelectric Power Station (Гидроэлектростанция - ГРЭС)
DDE	Division of the detained escort (Отдел Конвойной Охраны - ОКО)
Energolesokombinat	Power Forest Combine (Энерголесокомбинат)
ITL	Forced Labor Camp (Исправительно-трудовой лагерь ИТЛ aka Gulag)
Kazgosstroyproekt	Kazakh State Construction Project (Казгосстройпроект)
KhMAO	Khanty-Mansi Autonomous Area (ХМАО)
Komsomol	All-Union Leninist Young Communist League aka VLKSM (ВЛКСМ - Всесоюзный ленинский коммунистический союз молодёжи)
Lengiprotrans	Leningrad Planning and Surveying Transportation Institute (Ленгипротранс)
MINENERGO	Ministry of Power stations construction of the USSR (МИНЭНЕРГО)
MVD	Ministry of Internal Affairs, which included the militia service.
NKVD	People’s Commissariat of Interior
OSOAVIAKhIM	Society for the Promotion of Aviation and Chemical Defense (ОСОАВИАХИМ)
OVD	Department of Internal Affairs (отдел внутренних дел - ОВД)
OVPK	Detached militarized fire brigade (отдельная военизированная пожарная команда - ОВПК)
Profobcom	Union of Soviet Commercial Employees (совторговли)
RSFSR	Russian Soviet Federative Socialist Republic (РСФСР)
SNK	see Sovnarkom
SOBSME	Sverdlovsk Regional Bureau of Forensic Examination (СОБСМЭ)
Sovnarhoz	Regional Economic Soviet (совнархоз)
Sovnarkom	Council of People's Commissars (SNK)
UPI	Ural Polytechnic Institute, now Ural State Technical University History 1950-60
UPI tourist section	Туристская секция УПИ
UPI sports club	СК УПИ
Ueal OAG GVF	Operational Air Group of the Civil Air Fleet (Уральской ОАГ ГВФ)
Uralenergostroymekhanizatsiya	Urals Power Construction Mechanization (Уралэнергостроймеханизация)
Uralkhimmash	Ural Chemical Machine Building Works (Уралхиммаш)
Uralles	Logging enterprise trust (Ураллес)
Uralselmash	Ural Agricultural machines (Уралсельмаш)
Uralugol	Ural Coal Works (Уралуголь)
USSR	Union of Soviet Socialist Republics (СССР)
VCP(b)	All-Union Communist Party (Bolsheviks) is the name of the Soviet communist party from 1923 to 1952.
VOKhR	Paramilitary Security (ВОХР)
WWII Fronts	The Soviet WWII period "Fronts" were strategic groups of armed forces, including several armies, each with 3 or more divisions, etc. Their names mostly dated back to their original formation. There were, in fact, 3 Belorussian Fronts.