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
• It's 'read' during a reprimand
• Concocting it, actor produces something read to little devils?
• It may be read to a miscreant
• Reading to a spoiled brat?
• 1715 civil unrest law