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Terence Vincent Powderly (1849-1924), who led the Knights of Labor at the peak of its power as Grand Master Workman (1879-1893), and who later held important posts with the Bureau of Immigration (1897-1921), was also an avid and talented amateur photographer. Several thousand of his photographic images produced in the first decades of this century (ca. 1902-1921) have survived in the form of glass and nitrate-base negatives (the nitrate has since been converted to safety film) and as glass lantern slides. In addition to his own work, Powderly collected prints produced by other photographers. This digital collection currently contains over 300 images selected from the collection.