Union calls working conditions 'unsafe' at Kauffman Stadium

Ruppert Stadium (Kansas City) – Society for American Baseball Research

Royals to leave Kauffman Stadium, plan for $2B stadium district in Missouri

Stadiums are usually bad deals for cities. Kansas City unions want the Royals' to be an exception

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Nigerian labour unions protest new president's rise of living costs

Developer looks at land near speculated Royals ballpark site

AFGE Federal Prisons' Union Demanding Immediate Action to Address Unprecedented Staffing Crisis in Western U.S.

Baseball - Wikipedia

Twins set to ditch Metrodome _ but not just yet - The San Diego Union -Tribune

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Kansas City Royals reach labor deals with stadium workers

Union says Royals don't provide them clean water at Kauffman