Source  – whatreallyhappened.com

–   This FBI-document of 1947 recommends that “one Jack Rubenstein of Chicago” should not be called to testify for the Committee on Un-American Activities, for he is working for Congressman Richard M. Nixon. According to the Warren Commission, Ruby had no connections with Oswald, Organized Crime or the Government. No wonder the header reads “This is sensitive”.

http://whatreallyhappened.com/content/nixon-ruby-connection#axzz3Yd439LGD