Football, a game of passion, rivalry and loyalty.

But decades ago, beneath the cheers and the chance,

lay a different kind of warfare called hooliganism.

On a match day, everyone was your enemy.

We'll uncover the brutal, bloody battles where punching below the belt was a way of life.

It was just a die of my him. Gangster presents hooligans.

They were destroying the football club.

The game I alone.

Listen first on BBC Sounds.

BBC Sounds, music, radio, podcasts.

During the Second World War, the technology, techniques, agents and agencies that would shape modern espionage were developed.

Yet their stories could not be told at the time. They remained secret.

By the early 1970s, the James Bond books and films had created a glamorous fantasy of spycraft.

Yet the real role secret agents had played in World War II was still largely unknown to the public.

My name is Nigel West. I'm an intelligence historian.

Nigel West's real name is Rupert Allison, and he has also served as a

Conservative Member of Parliament. He's not the only man in this story with more than one identity.

I'm a natural ferreter and researcher, and what fascinated me really from about 1972 onwards,

was that we were rewriting the history of the Second World War.

West was fascinated

by the dangerous work of double agents.

Spies who pretended to work

...