Soviet Border Troops, (Russian: Пограничные войска СССР, Pogranichnyye Voiska SSSR) were the militarized border guard of the Soviet Union, subordinated to its subsequently reorganized state security agency: first to Cheka/OGPU, then to NKVD/MGB and, finally, to KGB. Accordingly, they were known as NKVD Border Troops and KGB Border Troops (with Russian abbreviations - НКВД СССР/- КГБ СССР added on the end of official names). Unlike border guards of many other countries, Soviet Border Troops also included the maritime borderguarding units (i.e., a coast guard).
The mission of the Border Troops included repulsing armed incursions into Soviet territory; preventing illegal crossings of the border or the transport of weapons, explosives, contraband, or subversive literature across the border; monitoring the observance of established procedures at border crossing points; monitoring the observance by Soviet and foreign ships of navigation procedures in Soviet territorial waters; and assisting state agencies in the preservation of natural resources and the protection of the environment from pollution. Border guards were authorized to examine documents and possessions of persons crossing the borders and to confiscate articles; to conduct inquiries in cases of violations of the state border; and to take such actions as arrest, search, and interrogation of individuals suspected of border violations.
The People's Commissariat for Internal Affairs (Народный комиссариат внутренних дел, Narodnyy Komissariat Vnutrennikh Del), abbreviated NKVD (НКВД listen ), was a law enforcement agency of the Soviet Union that directly executed the will of the All Union Communist Party. It was closely associated with the Soviet secret police, which at times was part of the agency, and is known for its political repression during the era of Joseph Stalin.
The NKVD contained the regular, public police force of the USSR, including traffic police, firefighting, border guards and archives. It is best known for the activities of the Gulag and the Main Directorate for State Security (GUGB), the predecessor of the KGB. The NKVD conducted mass extrajudicial executions, ran the Gulag system of forced labor camps and suppressed underground resistance, and was responsible for mass deportations of entire nationalities and Kulaks to unpopulated regions of the country. It was also tasked with protection of Soviet borders and espionage (which included political assassinations abroad), influencing foreign governments and enforcing Stalinist policy within communist movements in other countries.