 Most Soviets allowed to leave during this time period were ethnic Jews permitted to emigrate to Israel after a series of embarrassing defections in 1970 caused the Soviets to open very limited ethnic emigrations.The fall of the Iron Curtain was accompanied by a massive rise in European East-West migration.Famous Eastern Bloc defectors included Joseph Stalin's daughter Svetlana Alliluyeva, who denounced Stalin after her 1967 defection.