One of the nation's top former counterintelligence officials says the Pentagon's decision not to investigate hundreds of purchasers of child pornography--including more than a dozen with security ...

Top FBI officials have told members of Congress that every Chinese counterintelligence case investigated by the FBI since at least 1991 may have been compromised by a suspected agent of the Chinese ...

Chinese hackers breached eight American telecommunications companies and obtained access to sensitive data for an extended period, a senior counterintelligence official revealed this week. Michael C.