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Tell me about MI5 in Britain.
I. History

The British Military Intelligence (DMI), abbreviated as MI (Military Intelligence), originally belonged to the British War Department. 1964 After the War Department was merged into the British Ministry of Defence, MI was also merged into the Defence Intelligence Staff (DIS).

The Military Intelligence Bureau has many branches with different functions, as follows:

MI 1 (MI 1): responsible for encryption and decoding. After being merged.

MI2: Responsible for intelligence in the Middle East, the Far East, Scandinavia, the United States, the Soviet Union and Central and South America. Cancel later.

MI3: Responsible for intelligence work in Eastern Europe and the Baltic Sea. Cancel later.

MI4: Responsible for map information. After being merged.

MI5: Responsible for internal intelligence work in Britain, with functions similar to those of the Federal Bureau of Investigation. Later, it was renamed "British Security Service".

MI6: Responsible for British foreign intelligence, with functions similar to those of the US Central Intelligence Agency. Later it was renamed "Secret Intelligence Agency".

MI7: Responsible for propaganda. After being merged.

MI8 (MI8): Responsible for telecommunications interception and communication security. Later, it was merged into the British National Communications Intelligence Agency (GCHQ).

MI9: Responsible for helping British prisoners escape from prison and interrogating enemy prisoners. Cancel later.

MI 10 (MI 10): responsible for technical information. After being merged.

Mi11(mi11): responsible for military security. Cancel later.

MI 12 (MI 12): responsible for secret surveillance. Cancel later.

MI 14 (MI 14): responsible for aerial photography of Nazi Germany and its occupied areas. It was later merged into MI6.

MI 15 (MI 15): responsible for aerial photography in other areas. 1943, this work was changed to the British air force department.

MI 16 (MI 16): responsible for scientific information. After being merged.

MI 17 (MI 17): British military intelligence secretariat. Cancel later.

Mi19 (mi19):19412 took over from MI 9 in February and was responsible for interrogating enemy prisoners of war. Cancel later.

Meter (JIS): Axis Planning Group. Cancel later.

Russian liaison agency. Cancel later.

After World War II, various military intelligence agencies were gradually abolished or merged into MI5 (later renamed "British Security Agency"), MI6 (later renamed "Secret Intelligence Agency") and GCHQ.

Second, the status quo of MI5

MI5 has been renamed "British Security Service", but it is still customarily called "MI5", and its headquarters is located in the Thames Tower in London. It is a British counterintelligence and national security agency, working under the leadership of the Home Secretary, but not under the British Home Office. The responsibility of foreign national security is the responsibility of MI6.

1, responsibilities:

Responsible for defending British security and responding to the threat of secret organizations that endanger national security. These threats include terrorism, espionage and the proliferation of weapons of mass destruction. In addition, it also provides security advice to many institutions to help them reduce the possibility of being threatened.

2. Purpose:

Suppression of terrorism; Protect Britain from losses caused by foreign espionage and secret activities of other countries; Countries that prevent the proliferation of weapons of mass destruction purchase relevant materials, technologies and professional skills; Guard against new threats and avoid the resurgence of old threats; Protecting sensitive national information, assets and important national infrastructure; Assist law enforcement agencies to reduce serious criminal activities; Assist the Secret Intelligence Agency and the Government Communications Headquarters to perform their statutory duties.

3. Objectives:

Protect national security and economic development, and support law enforcement agencies to prevent and investigate serious criminal activities; Collect and publish information; Investigate and assess threats; Cooperate with other institutions to deal with threats, provide suggestions on protective measures, and provide effective support for the above actions.

4. Employees

At present, the Security Bureau has about 3,000 employees. Among them, 44% are women, 54% of employees are under 40 years old, and 240 are seconded or appointed from other government departments or institutions.

The main investigation, evaluation, policy and management work is the responsibility of ordinary staff who account for two-thirds of the total number. They are supported by professionals who are proficient in language, technology, monitoring, information technology, communication, security protection, administrative affairs, construction services and catering support.

5. Organizational structure

The current director is Jonathan Evans, assisted by the deputy director in charge of intelligence and security consulting, counter-espionage, counter-proliferation and operational capability of the Security Bureau.

Set up six branches, each led by a director.

The deputy director directs four departments, one is responsible for combating international terrorism, and the other is responsible for providing suggestions on security protection measures to deal with various threats, as well as anti-proliferation and anti-espionage work. The third branch is responsible for counter-terrorism in Northern Ireland and at home. The fourth section is responsible for the operational capability of the Security Bureau, such as technology and surveillance.

The director directs two departments. One is responsible for the personnel and safety of the Security Bureau; The other is responsible for managing information and archives, finance and facilities. The secretariat and legal adviser of the Security Bureau assist the work of the Director and the Deputy Director.

The above contents are taken from the official websites of Wiki and MI5 (http://www.mi5.gov.uk/output/index-chinese.html) respectively.