From Wikipedia:
[A] Taiwanese American scientist who worked for the University of California at the Los Alamos National Laboratory. He created simulations of nuclear explosions for the purposes of scientific inquiry, as well as for improving the safety and reliability of the U. S. nuclear arsenal. A federal grand jury indicted him of stealing secrets about the U. S. nuclear arsenal for the People's Republic of China (PRC) in December 1999.
https://en.wikipedia.org/wiki/Wen_Ho_Lee
The charges agains Wen were ultimately dropped, and $1.6 million paid from the US Government and media organizations, though his reputation continued to suffer. He's now retired.
The second thing that strikes me is to never talk to law enforcement. The lying to Federal agents charge came from Chen's describing a trip as occurring in 2011 rather than 2012.