His half-brother from his mother's previous marriage, was Raoul Wallenberg.
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Guy von Dardel was active in searching for and establishing the fate of his half-brother, Raoul Wallenberg, who was apprehended by Soviet troops in Hungary towards the end of World War II and subsequently disappeared.
Perhaps Dellapenna’s most noteworthy litigation was as co-counsel for the family of Raoul Wallenberg in a case brought by Wallenberg’s half-brother, Guy von Dardel.
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