Just two days after the assassination of President John F. Kennedy, a suspected killer and known foreign terrorist was captured in Dallas, Texas. The U.S. government was aware the man had received rigorous training in a foreign military and was a member of a covert paramilitary organization that already had murdered dozens, if not hundreds of people, including military officers, high ranking police officials and democratically elected politicians. President Kennedy speaking in Fort Worth the morning of Nov. 22, 1963 Amazingly, according to the authors of an explosive new book promising to unravel the 40-year mystery of who killed JFK,...