Possible Clues:

• It's 'read' to an unruly crowd
• A vigorous reprimand (when read)
• Measure to avoid disorder in South American diplomacy?
• Rule to stop rising in court after barrister's closing bit
• Warning Brazilian city against diplomacy
• 1715 civil unrest law
• ''Reading'' to rowdies
• Lecturer's reading?
• It may be read to a miscreant
• Olympic city with diplomatic approach that's read as a severe warning