MI6 (British military counter-intelligence office)

British MI6 (British Secret Intelligence Service, MI6 SIS) is one of the world's six largest intelligence agencies, founded in 1909, formerly known as the Secret Intelligence Service Foreign Branch, responsible for collecting intelligence for the British government around the world, mainly using secret intelligence officers (agents), direct surveillance, communications interception, intrusive surveillance and other means for the protection of the British national security, to protect Britain's economic interests and so on. (Source: MI6 official website)