Historical clue formulations

• Gangsters' gals — 2018-03-07
• Unlawful partners — 2015-02-13
• Gangsters' gals — 2008-02-12
• Tough companions? — 2007-07-20
• Gangster gals — 2006-01-31
• They run in gangs — 2002-08-25
• Tough companions? — 1999-07-30
• Gangster's gals — 1997-03-30
• Gangland gals — 1994-07-31