A dossier, compiled by former Met commander Brian Paddick in 2004, warned police chiefs that they needed to take tougher action to stop officers discriminating against black people.
The report, obtained by the Guardian, said that innocent African-Caribbean people were being targeted too often under stop and search powers by officers who were wrongly racially stereotyping them as criminals.
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Reports in the Daily Mail and the Telegraph said published guidance has been changed for 2018 to only fly the Union flag on Remembrance Day.
The author, who explored feminist themes, was best known for her Earthsea books.
Jon Lansman denied reports that the group's supporters had drawn up a deselection hit-list of 50 centrists.