Louis de Wohl worked as an astrologer for the British intelligence agency MI5, after it was claimed that Hitler used astrology to time his actions.

The Double-Cross System, or XX System, was a World War II anti-espionage and deception operation of the British military intelligence arm, MI5.

* Penetration of British intelligence ( MI6 ) and counter-intelligence ( MI5 ) services.

The Security Service, commonly known as MI5 ( Military Intelligence, Section 5 ), is the United Kingdom's internal counter-intelligence and security agency and is part of its core intelligence machinery alongside the Secret Intelligence Service ( SIS or MI6 ) focused on foreign threats, Government Communications Headquarters ( GCHQ ) and Defence Intelligence ( DI ).

In the aftermath, MI5 ceased sharing intelligence with the Dublin Metropolitan Police.

Agents who agreed to this were supervised by MI5 in transmitting bogus " intelligence " back to the German secret service, the Abwehr.

Executive Liaison Groups enable MI5 to safely share secret, sensitive, and often raw intelligence with the police, on which decisions can be made about how best to gather evidence and prosecute suspects in the courts.

Each organization works in partnership throughout the investigation, but MI5 retain the lead for collecting, assessing and exploiting intelligence.

The Econonmist said: " The origins of the proposed legislation lie in civil cases brought by former Guantánamo detainees, the best-known of whom was Binyam Mohamed, alleging that government intelligence and security agencies ( MI6 and MI5 ) were complicit in their rendition and torture.

* Michael Bettaney, a former MI5 intelligence officer convicted of Official Secrets offences in 1984

On 19 June 2006 the International Herald Tribune reported that Michael Howard would become chairman of Diligence Europe, a private intelligence and risk assessment company founded by former CIA and MI5 members.

* The extensive " double-cross " system run by MI5 to feed misleading intelligence to the Germans

In 1935, two years after Adolf Hitler came to power in Germany, Iona von Ustinov began working for the British intelligence service MI5 and became a British citizen, thus avoiding internment during the war.

With MI5 reduced to a skeleton staff of just 28 officers and relegated to the sidelines, and with Thomson unable to contain or penetrate the revitalized IRA with a series of clumsy and hastily organized police intelligence operations, it fell to Smith-Cumming and SIS ( then MI1 ( c )) to organize a new espionage unit in Ireland, based on continental lines and called the Dublin District Special Branch, in mid-1920.

Four of the British casualties were military intelligence officers and another four were Secret Service or MI5 agents.

The Metropolitan Police Service's DPG ( Diplomatic Protection Group ) provides protection for ministers in London, acting on intelligence from MI5.

On 19 August 1998, Archbishop Desmond Tutu, chairman of South Africa's Truth and Reconciliation Commission ( TRC ), stated that recently uncovered letters had implicated the British MI5, the American CIA, and then South African intelligence services in the crash.

* Eddie Chapman (" ZigZag ") infiltrated the German Abwehr during World War II whilst feeding intelligence to MI5.

Tegart and his deputy David Petrie ( later head of MI5 ) advised a greater emphasis on foreign intelligence gathering and closure of Palestine's borders.

During World War II, Hart worked with MI5, a division of British military intelligence, where he renewed Oxford friendships including working with the philosophers Gilbert Ryle and Stuart Hampshire.

However, these agencies are not to be confused with the more encompassing work of larger more dedicated " intelligence agencies " such as CSIS, MI5, MI6, or the CIA.

According to the book Spycatcher by Peter Wright ( published in 1987 ) the technique is standard practice that has been used by MI5 ( and other intelligence agencies ) for many years, under the name " Barium meal test ".

These rambling postings often appear as clusters of twenty or more messages with varying subjects and content, but all related to Mike Corley's perceived surveillance of himself by MI5, the British intelligence agency.

Reportedly, Zatuliveter had been identified by MI5 ( UK Security Service ) when surveillance linked her to another person with close links to the Russian embassy in London ; the latter was suspected of working for the SVR, Russia's foreign intelligence service.

The remit of the department also includes policing and matters of national security, as the Security Service, MI5, is directly accountable to the Home Secretary.

The author of the love letters was reportedly Hester Leggett, the head of Leslie's department at MI5, and not Paddy Bennett, later Lady Ridsdale, the only woman working in Room 39 under the command of Admiral John Henry Godfrey.

An updating of the late 1970s television series The Professionals, the series is set in a fictional government agency CI5 ( Civilian Intelligence department 5 as opposed to MI5, Military Intelligence ).

An updating of the late 1970s television series The Professionals, the series is set in a fictional government agency CI5 ( Civilian Intelligence department 5 as opposed to MI5, Military Intelligence ).

MI5 learned of this and reported it to Home Secretary Herbert Morrison in October.

On 1 December 2002, following the release of declassified documents ( including the diary of wartime MI5 head Guy Liddell ), investigative journalist Martin Bright published an article in The Observer that claimed Home Secretary John Anderson intervened to prevent Mitford being questioned on her return from Germany and that the shooting, which " has become part of the Mitford myth ," may have been invented to excuse this.

During the war, the offices were renamed: the Home Section became MI5 or Security Service, while Smith-Cumming's Foreign Section became MI6 or the Secret Intelligence Service.

When Britain's Government Committee on Intelligence decided to slash Kell's budget and staff and subordinate MI5 under a new Home Office Civil Intelligence Directorate led by Special Branch's Sir Basil Thomson in January 1919, the powerful MI5 / Special Branch partnership that admirably managed counterintelligence and subversives during the war was suddenly thrown into disarray.

On 4 December 2010, it was reported that Zatuliveter was facing deportation in Yarl's Wood Immigration Removal Centre, after she was arrested by the Metropolitan Police Service on behalf of MI5 and the Border and Immigration Agency on 2 December 2010, on suspicion of espionage, the police action having been approved by Home Secretary Theresa May.

The Committee's recommendations went to the Home Secretary, who was not bound to accept them ; MI5 often lobbied him not to accept a recommendation to release.

On 17 March 2006 the Home Office alleged during its appeal case that Hicks had admitted in 2003 to the Security Service ( British intelligence agency MI5 ) that he had undergone extensive terrorist training in Afghanistan.

On the same day as these remarks, members of the Commons all-party Home Affairs Select Committee had their first meeting with Dame Stella Rimington, director general of MI5.

The Bill was introduced in the House of Commons on 22 February 2005 and allows the Home Secretary to make " control orders " for people he suspects of involvement in terrorism, including placing them under house arrest, restricting their access to mobile telephones and the internet and requiring that visitors be named in advance, so that they may be vetted by MI5.

* Public Record Office Secret History Files, Camp 020: MI5 and the Nazi Spies, Oliver Hoare, 2000.

Bennett had free and unfettered access to the archives of the Foreign Office as well as those of the Secret Intelligence Service ( SIS ), MI5, and MI6.

The headquarters for the Northern Ireland Office, MI5 and Thames House are also nearby.

Burgess, Donald Maclean and Anthony Blunt contributed to the Communist cause with the transmission of secret Foreign Office and MI5 documents that described NATO military and Marshall Plan economic strategy.

The IPI was run jointly by the India Office and the Government of India and reported jointly to the Secretary of the Public and Judicial Department of the India Office, and the Director of Intelligence Bureau ( DIB ) in India, and maintained close contact with Scotland Yard and MI5.

Initially three U Adcock HF DF stations were set up in 1939 by the General Post Office but with the declaration of war, MI5 and RSS developed this into a larger network.

Since December 1994, it has served as the headquarters of the UK Security Service ( commonly known as MI5 ), along with being the London site of the Northern Ireland Office ( NIO ).

* ' Camp 020: MI5 and the Nazi spies ' by Oliver Hoare ( Public Record Office, London, 2000 ) ISBN 1-903365-08-2

In the report they allege that those who represented themselves as from MI5, or the British Foreign Office, seemed unconcerned with their welfare.