Historical clue formulations

• Derby, for one — 2023-09-03
• Poison-pen letters — 2020-03-31
• Sour notes? — 2019-08-28
• Poison-pen letters — 2019-01-15
• Unwanted messages — 2018-09-21
• Some written rants — 2015-07-26
• Cross words? — 2014-12-20
• Letters that are hard to read? — 2014-10-23
• Nastygrams — 2012-07-29
• Often-anonymous intimidation technique — 2009-03-22
• Form of intimidation — 2008-03-29
• Poison pen letters — 1996-06-01
• Nasty letters — 1995-12-19