American labor leader Terence Vincent Powderly (1849-1924) presided over the Knights of Labor during the union's remarkable growth and rapid decline in the 1880s.

Terence V. Powderly was born in Carbondale, Pa., on Jan. 22, 1849. His parents were Irish immigrants. At 13 he began work in a railroad yard. At 17 he apprenticed himself to a machinist and began to practice the trade in 1869 in the shops of the Delaware and Western Railroad in Scranton, Pa. Interested in labor unionism, he joined the International Union of Machinists and Blacksmiths in 1871 and, in 1874, was an organizer for the Industrial Brotherhood. That year he was initiated into the Noble and Holy Order of the Knights of Labor, a small secret society centered on Philadelphia. Powderly organized the Knights' local assembly in Scranton and was elected its master workman in 1876; he was also an officer in district assembly no. 5.

In 1878, at the age of...