Donald W. Duncan (born 1930), American soldier and anti-war activist
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Donald F. Duncan, Sr. (1892–1971), American toy manufacturer and inventor
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Hubbard suggested that CCI combine their efforts with Jane Fonda, Rev. Dick Fernandez of Clergy and Laymen Concerned about Vietnam (CALCAV), Mark Lane, and Donald Duncan (who had previously testified at the Russell Tribunal in Denmark).
Local laborer and railway worker Donald Duncan was killed after coming into contact with the bridge while on top of a Great Western Railway caboose.