Decoding the Black Women Code Breakers and the Secret War Against Stalin's Bomb

Overview

In this episode, Flora Lichtman chats with Dr. Sarah Valentine about Decoding the Black Women Code Breakers and the Secret War Against Stalin's Bomb, shedding light on Black women who served as cryptologists in the US during the Cold War and whose work helped decipher intercepted Soviet nuclear intelligence.

• the hidden labor of Black women within a segregated, early- computing era
• how transcription and keyword spotting worked as a manual form of data processing
• the transition from manual processing to automation with SOAP Flakes and early machine learning
• archival discoveries including declassified NSA interviews and Eleanor Roosevelt correspondence

Introduction and guest

the podcast opens with Flora Lichtman introducing Dr. Sarah Valentine, author of a new book that revises the Cold War narrative by highlighting a group of Black women who decoded Soviet messages for US intelligence. Valentine explains how she stumbled upon references to Invisible Cryptologists on an NSA site and why this history matters for both intelligence history and the broader story of race and gender in tech.

The traffic processing division

Valentine describes the traffic processing division as a basement workspace at Arlington Hall, a chaotic, densely packed area with hundreds of workers. White analysts occupied the upper floors, while the basement housed the processing unit where encoded Cyrillic telegraph strips were read and sifted for military and nuclear-relevant keywords. The work was grueling, repetitive, and required filtering through millions of messages each week, with only a small percentage containing actionable intelligence.

Recruitment, training, and daily life

Women, largely from the middle class and Black communities in the DC area, were recruited through word of mouth. They received government benefits and retirement options unavailable to many Black workers in other sectors. Though many had college degrees, segregation limited their advancement, and they were trained for lower-level cryptanalytic roles within a segregated system. Valentine underscores how this environment intersected with broader civil rights-era constraints while offering stable federal employment with benefits.

In the archive and the Iris Carr story

The book profiles Iris Carr, a Texas schoolteacher who relocated to Washington, DC seeking better retirement prospects. Carr progresses from the traffic division to a managerial role, illustrating the hard-won leadership paths available to Black women even in a highly segregated setting.

Computing history and the women behind it

The guests connect these cryptologists to the genesis of modern computing. Their manual keyword-searching work functioned as a GPU-like processing unit, laying groundwork for automation. Valentine recounts how the Agency later trained a top-secret project known as SOAP Flakes and how these women helped to build and train this machine, using a list of 1500 Russian keywords to teach the system what to look for.

Automation and obsolescence

As SOAP Flakes came online in the mid-1950s, the traffic processing unit diminished, effectively putting some of the workers out of the job. Yet Valentine notes that the experience formed a foundation for computing and programming roles that followed, and the interviews she uses as primary sources are often from women reflecting on these transitions years later.

Research methods and anecdotal discoveries

Valentine’s book relies heavily on declassified NSA interviews and other archival material, including a striking anecdote about Eleanor Roosevelt’s signature on an original note found in the National Archives. The discovery underscores the layered history of government work and civil rights-era politics behind secrecy and declassification.

Translation as code breaking

The host and guest reflect on translation as a form of code breaking, drawing parallels between literary translation and cryptanalysis. Valentine notes that cryptography’s early era resembled a puzzle-solving marathon, akin to deciphering a difficult crossword under time pressure.

Legacy and adaptation

The conversation closes with reflections on how these stories reshape our understanding of computing history, along with a light note about a potential film adaptation and how to access an excerpt of the book on the Science Friday site.