Swedish Prime Minister, Tage Erlander, turned down an offer from the Soviet Union KGB to trade Raoul Wallenberg for Soviet spy Stig Wennerstrom then in prison in Sweden. The offer was confirmed in 1991 by the participants, Otto Danielsson and Carl Persson of the Swedish Government and the go-between with the Soviets, Carl Gustav Svingel, who lived in Berlin. The seriousness of this proposal was also confirmed by the late Swedish Prime Minister, Tage Erlander. When Svingel asked his Soviet counterpart if Wallenberg lived, he was informed that "We usually don't negotiate about dead people."