The Nazi Refugee Who Gave Stalin the Atomic Bomb

Added: 2026-05-22

[00:00:00]In 1943, America trusted a quiet German physicist with their most deadly secret.

[00:00:06]Klaus Fuchs had fled Nazi Germany.

[00:00:09]Brilliant scientist, impeccable credentials, perfect for the Manhattan Project. What they didn't know, he was already working for the Soviets. For four years, Fuchs helped design the plutonium bomb that would destroy Nagasaki. And every blueprint, every calculation, every secret went straight to Moscow. His handler was Harry Gold.

[00:00:29]They used dead drops in New Mexico.

[00:00:32]Fuchs would leave classified documents under bridges, in hollow trees, anywhere the FBI wouldn't look. He worked alongside Einstein, Oppenheimer, the world's greatest minds. None of them suspected a thing. But in 1950, American code breakers cracked a Soviet message.

[00:00:49]The Venona Project revealed a spy inside Los Alamos. When confronted, Fuchs calmly confessed everything. His reason?

[00:00:57]He believed giving Stalin the bomb would prevent American nuclear dominance. The quiet physicist who helped end World War II had just started the Cold War. His betrayal launched a nuclear arms race that nearly destroyed the world.