During the Spanish Civil War, the city of Madrid became a focal point of conflict between Republican and Nationalist forces. The siege of Madrid, which began in October 1936, lasted for over two years, with the city ultimately falling to the Nationalist armies on March 28, 1939. On November 7, 1936, the Republican authorities took control of political prisoners and rebel military personnel in Madrid. Fearing their presence during the battle, they conducted extractions, leading to the tragic Paracuellos massacres. Approximately 5,000 prisoners were incarcerated in Madrid since before the war began. Many of them had been captured during the failed rising of the Montaña barracks in western Madrid. The prisoners were told they would be set free, but instead, they were taken by trucks to fields outside Paracuellos del Jarama and Torrejón de Ardoz, where they were shot and buried in mass graves. This poster of the National Confederation of Labor (CNT) commemorates this pivotal moment in Madrid’s history, serving as a visual reminder of the human cost of war and the complexities of political conflict.