Claim: Delmer Berg was an American soldier who volunteered to serve with the XV International Brigade (nicknamed the Abraham Lincoln Brigade) during the Spanish Civil War that has four and who began serving as a union organizer in the 1950s, then became an official of the Federal Bureau of Investigation.
Evidence: Einsley Delmer "Del" Berg (December 20, 1915 – February 28, 2016) was an American soldier and union organizer who volunteered to serve with the XV International Brigade (nicknamed the Abraham Lincoln Brigade) during the Spanish Civil War. He began serving as a union organizer in the 1950s, and, in a 2007 interview, described the steps he took to discourage the attention of Federal Bureau of Investigation agents.