In the fight against terrorism, national agencies keep full control over their police forces, security and intelligence agencies and judicial authorities.

You can't get closer to the heart of national sovereignty than national security and intelligence services.

Both collected intelligence for spy agencies in Taiwan, causing a serious threat to China's national security.

You can't come forward against the world's most powerful intelligence agencies and be completely free from risk.

Ever since 9/11, our intelligence agencies, as part of the 'war on terror,' have expanded their operations to include American citizens. I was 'terrorized' when I learned that the National Security Agency was intercepting information on Americans.

Police forces collect information to be used in a public court to get people convicted. Security services gather information that does not necessarily lead to people being prosecuted and in many cases needs to remain confidential.