Barry Effron says his religious uncle Reuben's fluency in 6 languages and law office devoid of books raised his suspicions - and his sighting of a UFO in 1957 Russia confirmed them

Silverman was spiritual leader of Shearith Israel from 1954 to 1964; Jack Ruby, a nightclub owner with links to the Mafia who shot Lee Harvey Oswald, was one of his congregants

In new book 'Kennedy’s Avenger,' Dan Abrams and David Fisher dig deep into the trial of the Jewish nightclub owner, who shot JFK's assassin and sparked endless conspiracy theories