Historical clue formulations

• Die-hard types — 2019-06-20
• Fanatics — 2018-02-28
• Fanatics — 2012-03-12
• Extremists — 2000-03-19
• Extremists — 1999-02-20
• Nuts, so to speak — 1998-05-07
• Big fans — 1996-03-23