Workers clearing out the basement of Argentina’s Supreme Court made a startling discovery recently. They found boxes filled with swastika-stamped notebooks, propaganda material and other Nazi-era documents. The boxes had been stored there for more than eight decades, the court said, and were uncovered by accident because workers were going through archives for the creation of a Supreme Court Museum. Upon opening the boxes, they found “material intended to consolidate and propagate Adolf Hitler’s ideology in Argentina, during the height of World War II,” according to a statement from the court in Spanish. Last week, officials, researchers and members of...