"Citation needed" 

I'm not sure why the citation is requested in the next to the last paragraph, but here is one for anyone who cares to enter it properly:

Valentine, Paul W. (Washington Post Staff Writer).  "7,000 Arrested in Disruptions," The Washington Post, Times Herald (1959-1973), May 4, 1971; ProQuest Historical Newspapers The Washington Post (1877-1990), page A1.

  "Busloads of prisoners were shuttled to jails, including an emergency outdoor detention center haastily set up at a Washington Redskins practice field near RFK stadium.  Later, 2,481 of them were transferred to the Washington Coliseum.
  "At 11:oçlock last night, Chief Judge Harold H. Greene of D.C. Superior Court ordered police and National Guard authorities to justify the mass arrests of demonstrators without listing names or details of where, when and how they committed their alleged offenses."

Notice that this article falls into the collection mentioned in the References: The Washington Post, various news articles, May 1-7, 1971.  I'm sure a law student in DC could find the reference within the records of the various courts that handled the 7,000 detainees ["7,000 Arrested In Disruptions" By Paul W. Valentine, Washington Post Staff Writer; The Washington Post, Times Herald (1959-1973); May 4, 1971; A1].

More important to me, the last sentence in the article has no citation.  Yes, that's the way i remember it.  I also recall that the compensation was not ordered until sometime in the 1980s.  I don't think ALL of the arrests were declared unconstitutional, but memory is a tricky thing.
filé gumbo