A neo-Nazi thug who attacked his girlfriend with a machete happened to be a paid undercover agent working for MI5. When the woman took the spy to court, MI5 tried to manage the media fallout but ...

"In season five of 'Slow Horses,' everyone is suspicious when resident tech nerd Roddy Ho has a glamorous new girlfriend, but ...

Confessions of double agents and tips for new spies have been released as part of a tranche of recently-declassified documents from MI5. The documents are part of a new exhibition on display at ...

MI5 lied to three courts while defending its handling of a misogynistic neo-Nazi state agent who attacked his girlfriend with a machete, the BBC can reveal. Arguing for secrecy, the Security ...

Three Bulgarian nationals have been found guilty of spying for Russia, in what police have described as "one of the largest" ...

Orlin Roussev, from Great Yarmouth, was the "sloppiest" of the five Bulgarians involved in "spying on an almost industrial ...

Among them was a beautician, a martial arts instructor and a financial service adviser, and together they managed to conduct one of the most complex spying operations of our time. Mark Hollingsworth l ...

A member of MI5 claimed that the spy agency tampered with the IRA’s Enniskillen bomb before it exploded. Eleven people lost their lives when the 40lb bomb exploded at a cenotaph in the Co ...

A Sussex author has examined the surprising connection between the captain of the Titanic and the mysterious death of an MI5 spy.

Marsalek, the Wirecard executive who went on the run five years ago after the dramatic implosion of the German payments company, was a Russian spy directing espionage operations across Europe, ...