For several decades the United States took UFO reports very seriously. In fact, it was the Air Force that coined the term UFO in the first place. Government-sponsored UFO investigations are documented like never before in the new book UFOs and Government: A Historical Inquiry.
Steve Rosen and Keith Weissman were indicted under the 1917 Espionage Act, an almost-never used relic of World War I. The government also sought to have the defendants -- US citizens -- tried in secret.