The Spanish Civil War (1936–39) was the bloodiest conflict western Europe had experienced since the end of WWI in 1918. It was a breeding ground for mass atrocities.
Axis Invasion of Yugoslavia
Book Review: The Spanish Holocaust - WSJ
The Spanish Holocaust: Reframing the Civil War - The Volunteer
Some Were Neighbors: Choice, Human Behavior, and the Holocaust
Spanish Civil War Holocaust Encyclopedia
Martha Gellhorn: Eyewitness to War, The National WWII Museum
Professional Development Virginia Holocaust Museum
The Last Days of the Dachau Concentration Camp, The National WWII Museum
Collaboration - Photograph
Spanish Civil War, Definition, Causes, Summary, & Facts
Tribute to the exiled and deported - The European Observatory on Memories of the University of Barcelona's Solidarity Foundation
Sej a Mensch - Be A Human Being
United States Holocaust Memorial Museum - Wikipedia