Some advice was to not wear false beards, carry plenty of spare change and engage in a good cover story.

Anthony Blunt confessed in 1964 to being a Soviet agent, but Elizabeth II was not informed.

The 98-year-old was one of the last surviving veterans of the secret Special Operations Executive.

The site in Manhattan was used to help China identify pro-democracy activists, prosecutors say.

The spy agency has released its notoriously tricky annual Christmas puzzle.

Federal authorities allege the man was paid millions to buy firearms and ammunition for North Korea.

Bulgarian nationals Katrin Ivanova, Vanya Gaberova, and Tihomir Ivanchev, deny a conspiracy to spy.

A Russian foreign ministry spokeswoman says the British ambassador had also been summoned.