At the end of World War II, General Eisenhower made a decision to personally visit as many Nazi concentration camps as he could. His reason? A belief that people would someday deny the Holocaust had ever happened. Eisenhower wanted to be in as many pictures as possible to prove the death camps really existed. He was sometimes accompanied by Generals Bradley and Patton.

It didn’t take long for Eisenhower’s concerns to materialize. Despite his presence in many photographs, Holocaust deniers persist to this day. But what do examples of primary evidence, maintained in official U.S. National Archives, reveal?