Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The MI5 Military Intelligence, Section 5 or the Security Service, is the UK's internal counter-intelligence and security agency. It forms part of UK's core intelligence machinery alongside focused on foreign threats, Government Communications Headquarters and Defence Intelligence. The MI5 has a statutory basis in the Security Service Act 1989 and the Intelligence Services Act 1994. Its roles include the protection of British parliamentary democracy and economic interests, counter-terrorism and counter-espionage within the UK. Although primarily concerned with internal security, the MI5 has an overseas role to support its mission...