During the Second World War, both sides utilized special infantry units to infiltrate and sabotage important enemy buildings or locations. Although these agents were utilized more frequently by the Allies and were sometimes trained for espionage as well, the Soviets did also use Saboteurs in some cases. After the war, Saboteurs, as well as thieves, were retired as their duty was taken by Spies, who became able to sabotage enemy buildings.