Considering that the Mossad is quite possibly the most ruthless and efficient intelligence agency in the world, it is peculiar that they have never been scrutinized in relation to the Kennedy assassination, especially when practically every other entity in the world (short of Elvis impersonators) has been implicated. But that all changed in January, 1994 with the release of Michael Collins Piper's Final Judgment. In this book, Piper says, "Israel's Mossad was a primary (and critical) behind the scenes player in the conspiracy that ended the life of JFK. Through its own vast resources and through its international contacts in the intelligence community and in organized crime, Israel had the means, it had the opportunity, and it had the motive to play a major frontline role in the crime of the century - and it did."
Their motive? Israel's much touted Prime Minister David Ben-Gurion, who ruled that country from its inception in 1948 until he resigned on June 16, 1963, was so enraged at John F. Kennedy for not allowing Israel to become a nuclear power that, Collins asserts, in his final days in office he commanded the Mossad to become involved in a plot to kill America's president.
Ben-Gurion was so convinced that Israel's very survival was in dire jeopardy that in one of his final letters to JFK he said, "Mr. President, my people have the right to exist, and this existence is in danger."