Among the many Puerto Ricans who fought on behalf of the Second Spanish Republic as members of the Abraham Lincoln Brigade, was Lieutenant Carmelo Delgado Delgado (1913–1937), a leader of the Puerto Rican Nationalist Party from Guayama who upon the outbreak of the Spanish Civil War was in Spain in pursuit of his law degree. Delgado was an anti-fascist who believed that the Spanish Nationalists were traitors. He fought in the Battle of Madrid, but was captured and was sentenced to die by firing squad on April 29, 1937; he was amongst the first US citizens to die in that conflict.