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This age-to-perfection episode of History Daily originally aired on March 9th, 2022.

It's 8 p.m. on September 27th, 1947, in the London Underground in the early days of the Cold War.

A German-born British physicist, Klaus Fuchs, sits on a subway train clutching a newspaper

and sweating profusely. Klaus is nervous. He previously worked with American scientists on the

Manhattan Project, and he has secrets pertaining to the creation of the atom bomb.

Tonight, Klaus plans to pass those secrets to the Soviets.

After the train pulls into the station, Klaus quickly makes his way through the platform,

climbs a flight of stairs, and emerges above ground on a street in the London suburb of Wood Green.

Klaus looks over his shoulder to make sure he isn't being followed. A coast is clear,

so Klaus keeps walking. The newspaper shakes in his hand as he crosses his street towards his

destination, the nag's head pub. Klaus steps inside and is greeted by the sound of laughter and a smell

of cigar smoke. He takes a seat at the bar, orders beer, and opens his newspaper, keeping his eye on

the door. And soon enough, Klaus sees a man entering the pub holding a red book. Klaus puts down

his newspaper as the man slides next to him at the bar. After exchanging pleasantries, the man

utters the secret password. Klaus nods his head in acknowledgement. He downs his beer, pays his bill,

and heads for the door. The man with the red book follows Klaus outside. There, on a discrete

side street, Klaus pulls an envelope out of his jacket pocket. He hands it to the man,

rushes across the street, and disappears back into the underground.

In the late 1940s, the work of Russian spies like Klaus Fuchs helps accelerate Soviet production

...