Just as FBI counterespionage agents were drawing a bead on Los Alamos nuclear-weapons scientist Wen Ho Lee, the files disgorged a curious fact: Lee's wife Sylvia had been an FBI "informational asset" at the very time Lee was suspected of passing classified warhead data to the People's Republic of China.
From 1985 to 1991, according to well-informed sources, Sylvia Lee, a native Chinese speaker who held a support-staff job at the Los Alamos National Laboratory, reported to FBI agents about visiting delegations of PRC scientists. She was not an "operational asset," jargon for paid informant, sources say, but a volunteer who...