Leo J. Czaja

Charles Hartung

Jack L. Callan

Jack L. Callan was a laborer at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

B. G. Williamson

B. G. Williamson worked for the Tennessee Eastman Corporation at the Y-12 Plant.

Eugene Schmanoff

Eugene Schmanoff was a staff worker at Los Alamos during the Manhattan Project.