Rogue History S02E06 - These Hidden Figures Cracked an Impossible Soviet Code

In the 1940's, the US government had a mission: find Soviet spies that had infiltrated their nuclear program. To do that, they needed to find a way to decode Soviet messages, notorious for being "unbreakable." So they turned to the Venona Project. This group of talented mathematicians, consisting largely of women, went on to expose spies in nearly every agency in the federal government.