Ellsberg’s cohort in stealing the Pentagon Papers was the late (thankfully) Anthony Russo, an avowed hardcore communist sympathizer and supporter of Hanoi.
Bet you didn’t see this in the newspapers. Some of Russo’s background can be found at the research site “www.Keywiki.org”, Search by his name “Anthony Russo”. Keep watching his page for updates as more information on his communist connections become available.
The same for communist fronts that Ellsberg supported.