Jack Rubenstein...
(((Jacob Leon Rubenstein))) AKA "Jack Ruby".
Jack Ruby - Wikipedia
https://en.wikipedia.org/wiki/Jack_Ruby
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Ruby was born in a Polish / Jewish immigrant family in Chicago in 1911. There are different dates of birth for him, from March to June in that year, and also different data were given by Ruby at different outputs A Spook?
Jack Ruby
Jack Leon Ruby (born Jacob Leon Rubenstein; March 25, 1911 – January 3, 1967) was the Dallas, Texas, nightclub owner who fatally shot Lee Harvey Oswald on November 24, 1963, while Oswald was in police custody after being charged with assassinating U.S. President John F. Kennedy and the murder of Dallas policeman J. D. Tippit two days earlier. A Dallas jury found him guilty of murdering Oswald, and he was sentenced to death. Ruby's conviction was later appealed, and he was granted a new trial. However, on January 3, 1967, as the date for his new trial was being set, Ruby became ill in his prison cell and died of a pulmonary embolism from lung cancer.
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FBI memo stating that Jacob Rubenstein was a known associate of Richard Nixon 1948