Manhattan project

Secret identity of fourth Soviet spy who stole US atomic bomb secrets finally revealed

The name of a missing Soviet spy which was hidden from the public for the past 70 years has just been revealed.

The American man stole U.S. atomic bomb secrets along with three other known individuals.

This stealing of highly classified information between 1940 and 1948 was said to fast-track the Soviet's development of nuclear weapons and the start of the Cold War.

For a long time, only three spies were blamed for this information leak but a man called Oscar Seborer has just been named as a fourth culprit.

His code-name was "Godsend" and he worked at the Los Alamos National Laboratory in New Mexico.

This is where the first nuclear weapons were designed.

Seborer's name was mentioned a few times in FBI documents that were declassified in 2011.

His betrayal of the U.S. came to the attention of historians John Earl Haynes and Harvey Klehr and the New York Times revealed that his story is finally being told.

The theory of a fourth spy being responsible for leaking atomic secrets along with David Greenglass, Klaus Fuchs and Theodore Hall, was proposed in the early 1990s.