Harley Filben

Harley Filben is a bum JC Denton encounters periodically in the first Deus Ex, before JC goes to Paris. The first time the player meets him (on the North dock of Liberty Island), Filben is an undercover contact for UNATCO, who passes information to JC regarding the NSF activity in the Statue of Liberty (if he is given the password "Iron and Copper"), as well as the key to enter the front doorway to the Statue complex. There is, however, some evidence that Filben is sympathetic towards NSF, including his insistence that the commander controlling the Statue, Leo Gold, is left alive.

The player meets Filben again in the Battery Park subway station in the NSF Airfield level. Here, he agrees to give JC the code to access the Brooklyn Subway Station (where the NSF hauls Ambrosia and other supplies to their La Guardia airfield), if he is paid.

In the second Hell's Kitchen level, Filben is found in the Underworld tavern. He reveals to JC that he was affiliated with the NSF all along (confirming the reason for his concern for Gold), and informs JC (with evidence) that the Midnight Sun reporter, Joe Greene, is really a UNATCO informant. In another astonishing twist, Filben reveals himself as a triple-agent; he works for UNATCO, the NSF and the Illuminati. JC asks him for Stanton Dowd's location (with success). After this level, Filben is not seen again.