Surveillance is necessary to protect national security  The primary concern of the state is the protection of its people from foreign powers. This usually means physical protection but this physical protection relies upon knowing what others are doing; where the threats are coming from. That means surveillance. There needs to be monitoring of groups that potentially pose a threat to the state or to its citizens. In a world where terrorism is as much a threat as other states there is a clear need to be watching as many people as possible around the world. Threats such as that to western interests in Yemen at the start of August 2013 demonstrate the need to be watching out for threats as intelligence picked up high level threats to western interests so allowing the United States and others to take pre-emptive action by closing embassies and evacuating personnel. [1]  [1] Hicks, Josh, ‘Chambliss: Threats ‘very reminiscent of what we saw pre-9/11’, The Washington Post, 4 August 2013,