skos:altLabel | - 1927 Columbine Mine massacre
- Colorado state police opened fire
- Columbine Massacre
- Columbine Mine
- Columbine Mine Massacre
- Columbine Mine massacre (1928)
- Columbine Mine strike
- Columbine massacre
- called a strike
- coal strike in Colorado
- first Columbine Massacre
- state-wide strike of twelve thousand coal miners
- striking miners were machine gunned
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