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Filter: Subject of labor unions
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| Date: | 1907 |
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| Description: | Cover of the book The Pinkerton Labor Spy by Morris Friedman. The book was a work of non-fiction detailing the use of spies during labor disputes b... |
| Date: | 1965 |
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| Description: | Monthly dues stamps on 2 pages of a dues book for the International Association of Machinists. |
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