Changes

The GRU continued to be the main structure for spying after the establishment of the Soviet Union, although modified and often renamed. After the rise of the Soviet Union, various organizations were formed that took some of the earlier lessons from the GRU and secret police organizations that were used by the tsars. The first was Cheka, then People's Commissariat for State Security (NKGB), the People's Commissariat for Internal Affairs (NKVD), which was based on the GPU established in the 1920s, and Ministerstvo gosudarstvennoy bezopasnosti SSSR (MGB). These agencies often succeeded each other or overlapped, but they also generally focused on domestic and foreign espionage.Many lessons were learned by these agencies during the 1920-1940s. Sabotage and deception campaigns destabilized the White Army that supported the reestablishment of the tsar. The intelligence agencies also infiltrated Mexico to assassinate Trotsky and his supporting group, who were seen as a rivals to Stalin, and many successful war time sabotage activities were conducted. These events help make the Soviet spy networks among the most effective in internal monitoring and supression and foreign espionage.

Perhaps the The most famous development in this time organization was the rise of the KGM (Komitet Gosudarstvennoy Bezopasnosti (KGB) that occurred carried out domestic and international spying. It had some notable successes in the Soviet periodBangladesh and Afghanistan in supporting local Communist supporting or sympathetic parties. HoweverEspionage operations were successful in gaining secrets from Western, in NATO rivals. Although many cases, incidents were classified.  Perhaps the general structure greatest successes of international spying developed in 1810 remained in the Soviet spy system, although with a lot was the obtainment of restructuring during atomic bomb information that allowed the Soviet Union to catch up to the United States. Klaus Fuchs and the Rosenbergs (Julius and Ethel Rosenberg) helped steal secrets for the atomic and hydrogen bombs. In many decades. The GRU continued to do most of respects, the Soviets would have developed these weapons anyways, but the spying after spy networks created in the establishment of United States helped to more rapidly develop these weapons at a time the Soviet Unionfeared it would loose the Cold War.