The "al Qaeda switchboard" was a known al Qaeda safe house and communications hub in Sanaa Yemen that intelligence agencies monitored prior to the 9/11 attacks. Key Details, Function: The facility was used to relay messages and phone calls from Osama bin Laden to al Qaeda operatives worldwide, (California). Monitoring: The National Security Agency (NSA) began monitoring the location in 1999. Key Figure: The safe house was run by Ahmad Mohammad Ali al-Hada and his son Samir Ali al-Hada, whose brother-in-law was Khalid al-Mihdhar, one of the future 9/11 hijackers in California. Intelligence Failure: In early 2000, the NSA intercepted calls from the Yemen "switchboard" to a "Khalid" in the United States (California). The Al-Qaeda Communication Hub in Santa Clara CA was run by Khaled Abu Dahab an Egyptian- born U.S. citizen, Silicon Valley car salesman and confessed member of the Egyptian Islamic Jihad terrorist organization. However, the intelligence of the c...