Michael Lewis tells the chilling story of Sergey Aleynikov in Vanity Fair:
Then he explained what he knew, or thought he knew: in April 2009, Serge had accepted a job at a new high-frequency-trading shop called Teza Technologies, but had remained at Goldman for the next six weeks, until June 5, during which time he sent himself, through a so-called “subversion repository,” 32 megabytes of source code from Goldman’s high-frequency stock-trading system. The Web site Serge had used (which has the word “subversion” in its name) as well as the location of its server (Germany) McSwain clearly found highly suspicious. He also seemed to think it significant that Serge had used a site not blocked by Goldman Sachs, even after Serge tried to explain to him that Goldman did not block any sites used by its programmers, but merely blocked its employees from porn and social-media sites and suchlike. Finally, the F.B.I. agent wanted him to admit that he had erased his “bash history”—that is, the commands he had typed into his own Goldman computer keyboard. Serge tried to explain why he had done this, but McSwain had no interest in his story. “The way he did it seemed nefarious,” the F.B.I. agent would later testify. [Emphasis mine]Wikipedia has some additional details on this extremely bizarre case, which I just don't seem to get!