Natan Sharansky to intense political pressure from Ronald Reagan. Sharansky and three low-level Western spies (Czech citizen Jaroslav Javorský and West German citizens Wolf-Georg Frohn and Dietrich Nistroy) were exchanged for Czech spies Karl Koecher and Hana Koecher held in the United States, Soviet spy Yevgeni Zemlyakov, Polish spy Marian Zacharski and East German spy Detlef Scharfenorth (the latter three held in West Germany). The exchange took place on the Glienicke Bridge between East and West Berlin, which had been used before for this purpose. Sharansky immediately immigrated to Israel, adopting the Hebrew name "Natan" and eventually simplifying his surname to Sharansky.
Natan Sharansky becoming a refusenik, Sharansky became a human rights activist, working as a translator for dissident and nuclear physicist Andrei Sakharov, and spokesman for the Moscow Helsinki Group and a leader for the rights of refuseniks. On 15 March 1977 Sharansky was arrested on multiple charges including high treason and spying for Americans. The accusation stipulated that he passed to the West lists of over 1,300 "refuseniks", many of whom were denied exit visas because of their knowledge of state secrets, which resulted in a publication by Robert C. Toth, "Russ Indirectly Reveal 'State Secrets': Clues in Denials of Jewish Visas".