David John
GE engineer recruited as an FBI cooperating witness who posed as a source to lure Xu to Europe and testified about his interactions during the trial.
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Mar 7, 2026 • 33min
The Sixth Bureau Episode 5: One Way In, One Way Out
Emily Gladfelter and Tim Mangan, federal prosecutors who led the legal fight, and David John, an engineer turned cooperating FBI source, join Bradley, the operative who ran the Brussels sting. They recount planning the overseas lure, choosing the meeting spot, staging surveillance and arrest, the transfer and trial logistics, and how evidence and courtroom drama led to a historic conviction.
