ALEXANDRIA, Virginia (CNN) -- Accused FBI spy Robert Hanssen pleaded not guilty Thursday to 21 charges of conspiracy and espionage, including 14 charges that could carry the death penalty.

WASHINGTON (CNN) -- The lawyer representing the wife of admitted spy Robert Hanssen said in a statement released Thursday that her client deeply regretted the harm done by her husband's activities.

The most high-profile cases in recent history involved former FBI agent Robert Hanssen and former CIA officer Aldrich Ames ... "This information is highly valuable, and it shouldn’t be surprising that ...