5. Disappearance of Raoul Wallenberg, 1945
Raoul Wallenberg was a courageous Swedish diplomat who was credited with saving the lives of at least 20,000 Hungarian Jews during the Holocaust . Arrested on espionage charges in Budapest following the arrival of the Soviet army, his subsequent fate remains a mystery despite hundreds of purported sightings in Soviet prisons, some as recent as the 1980s.
In 2001, after 10 years of research, a Swedish-Russian panel concluded that Wallenberg probably died (most likely executed by the Russians) in July of 1947, but to date no hard evidence has been found to confirm this.
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