Here's the FBI files on Nikola Tesla, the scientist of the secrets hidden in this document

The story of the infamous “death ray” is registered among the 10 myths that revolve around the FBI, but the story of Nikola Tesla was not only this, it isn’t merely a myth, but a thorough scientific study that has changed the course of history, leading,  as  first result, to the passageof alternating currents that dominates the world today, but that could have affected even more in the history of human progress, if he only had completed his studies.  To briefly summarize  this incredible secret, the  fastest and  most  complete  way is to have five minutes of patience and revise a portion of a film written and directed by Orson Welles, able to understand the deep knowledge that Tesla had virtually secured:

And now another surprise for our readers. The following is the file made public by FBI  on Nikola Tesla. A collection of reports of the activity of the scientist which has unfortunately been overshadowed in many respects but which contains a tasty track. Apparently, some of Tesla’s writings related to the interaction between the ionosphere and equipment for the wireless transmission of electricity is still existing, hidden in   a known American  library. Arm yourself with patience, the document has more than 200 pages and is written, of course, in English.