Espionage at the very heart of the government has always occurred. Johanna Lowry-O’Reilly looks at some of the more famous cases in the United Kingdom.

Historians will today seek the release of US grand jury records in the case of Julius and Ethel Rosenberg, whose espionage trial for passing atomic secrets to the Soviet Union became a defining moment in the Cold War.

A follower of Osama bin Laden received life in prison without parole for the deadly bombing of the US Embassy in Kenya after a New York jury was deadlocked amid concerns that imposing a death penalty would create a martyr.