Before Majestic 12
These events were so incredible that they defied belief. A stunned President Truman and his top military Commanders found themselves virtually impotent after having just won the most devastating and costly
war in history. The United States had developed, used, and was the only nation on earth in possession
of the Atomic Bomb which alone had the potential to destroy any enemy, and even the Earth itself. At that time the United States had the best economy, the most advanced technology, the highest standard of living, exerted the most influence, and fielded the largest and most powerful military forces in history.
The MJ12 documents are hoaxes, and progressive activists shouldn't waste time with them or their supporters, who are usually right wing.
http://www.csicop.org/articles/20000420-mj12/