Historical clue formulations

• Group lampooned in "Django Unchained" — 2017-04-16
• Group in the Bogart film "Black Legion" — 2010-04-09
• Group investigated in "Mississippi Burning" — 2008-07-14
• Kind of meeting in "O Brother, Where Art Thou?" — 2008-05-04
• Hateful group — 2005-05-18
• Hate group — 2001-10-10
• Hate group — 2001-01-28
• "The Birth of a Nation" group — 2001-01-05
• Group seen in the film "Legion of Terror" — 1999-10-13
• D. W. Griffith subject — 1999-05-28
• Grand Dragon's group — 1997-09-29
• Hoods in hoods — 1996-09-25
• Hateful group — 1995-04-29
• Part of K.K.K. — 1995-01-02