- International Union of Mine, Mill, and Smelter Workers✖[remove]1,548
- United Mine Workers of America1,534
- Coal miners1,533
- Congress of Industrial Organizations (U.S.)1,038
- Labor Unions1,032
- Labor movement1,032
- Coal mine accidents1,008
- Coal mines and mining1,008
- Coal mines and mining--Law and legislation1,008
- Coal mines and mining--Safety measures1,008
- Strikes and lockouts--Coal mining1,008
- Communism525
- United Furniture Workers of America525
- Race relations341
- Ku Klux Klan (1915- )340
- Elections339
- Political Parties339
- Politics and Government339
- Racism339
- Labor unions--Organizing5
