> The idea that the FBI would call the employer of a suspected spy, inform them that something was going to happen, that all of his colleagues would be informed, and then after a week they'd search his home, stands out as not a full explanation.
I don't think anyone, least of all OP, is suggesting this is what happened.
Everything is rank speculation at this point, but if I were going to speculate I'd speculate that Wang suddenly left the country of his own volition and the employer began investigating his disappearance and stumbled on things that led to them calling in the FBI.
That's still purely speculation, but it would account for the sequence of events and the manner of investigation way better than any ideas about him being "vanished" by the US government.
