sentences:  The "Gravel Edition" was edited and annotated by Noam Chomsky and Howard Zinn, and included an additional volume of analytical articles on the origins and progress of the war, also edited by Chomsky and Zinn.Beacon Press became the subject of an FBI investigation, an outgrowth of which was "Gravel v. United States" in which the U.S. Supreme Court ruled in June 1972 that the Speech or Debate Clause in the US Constitution did grant immunity to Gravel for his reading the papers in his subcommittee, and did grant some immunity to Gravel's congressional aide, but granted no immunity to Beacon Press in relation to its publishing the same papers.Zinn testified as an expert witness at Ellsberg's criminal trial for theft, conspiracy, and espionage in connection with the publication of the "Pentagon Papers" by "The New York Times".