Several lessons emerge from these defectors’ revelations. First, the motivations of defectors changed based on the circumstances around them, which reflected Soviet policy changes. Those policy changes, such as purges and increased domestic repression, were often at the foundation of defector’s motivations. Second, vetting standards for Soviet personnel assigned to sensitive national security positions fluctuated, depending on the stability in the Soviet government and the level of urgency for hiring new personnel. When the Soviet Union was stable, it had the luxury of enforcing strict standards. When the Soviet Union needed a lot of people fast—such as during purges or wartime—it did not vet them as thoroughly. Finally, the Soviet perception of threat evolved, beginning with Great Britain as the primary threat in the early Soviet era, and joined by Germany after 1933, although Stalin never abandoned hope for an accommodation with Hitler. However, even before Germany was defeated in 1945, Soviet intelligence began targeting its wartime allies. By the late 1940s, when the United States assumed the role of the leader of the democratic world, the label “main enemy” was coined and applied to the United States, which stuck for the rest of the Soviet era.