National Museum of Nuclear Science & History
Sidney Williams was a janitor at the University of Chicago’s Metallurgical Lab (“Met Lab”) during the Manhattan Project.
Sylvia Warshaw was a Polish-American who worked as a research assistant in the chemistry division of the Chicago Met Lab.
T. J. Kelly worked for the Kellex Corporation at the K-25 Plant.
Nathan Safferstein (1921-2013) was an American counterintelligence agent during the Manhattan Project.