Those are some wild conspiracy theories, the facts are that Lee Harvey Oswald, Sirhan Sirhan, and James Earl Ray are the convicted killers.
Facts are facts, Lee Harvey Oswald was a communist asssassin. He was very supportive of Fidel Castro and he even lived in the Soviet Union for awhile.
http://mcadams.posc.mu.edu/oswald.htm
Sirhan Sirhan was upset that Israel whooped ass on the Arabs in the recent 1967 war. He sure didn't like Kennedy's pro-Israel position.
http://www.who2.com/sirhansirhan.html
James Earl Ray was convicted in a court of law on the assassination of MLK. There are alot of conspiracy theories around it, but settintg aside the wild speculation. James Earl Ray is the killer.
Of course I got to say that its quite remarkable how MLK lived as long as he did what with the Ku Kluxers all around him down south. Most of whom BTW were generally Democrats and supporters of The New Deal.
If James Earl Ray were involved with the "Invisible Empire", then maybe Democratic
Sen. James C. Byrd would know something about it. Its public knowledge that the Democratic senator was a member of the Klan.