Historical clue formulations

• Advocate for a 61-Across, informally — 2024-03-01
• Workers' advocate, informally — 2021-10-24
• Local leader — 2019-06-08
• Worker's advocate, in brief — 2014-08-13
• Worker's advocate — 2013-02-21
• Shop steward, briefly — 2011-01-26
• One who labors for labor's sake? — 2010-04-15
• Shop steward, briefly — 2006-12-22
• Worker's advocate, for short — 2006-04-15
• Worker's advocate, for short — 2004-05-02