AAISWAmalgamated Association of Iron and Steel Workers (Pennsylvania)
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When the industry was dominated by the production of iron, ironmakers in general had a hard time checking the power of the AAISW, the skilled union of puddlers, because of the nature of their expertise.
Tensions between the skilled and unskilled, native and foreign, the lodges of the AAISW and the Knights of Labor, were muted there in part because of complementary religious and political traditions.
Accordingly, when Andrew Carnegie attempted to reduce wages and bust the AAISW, Homestead workers responded with unusual aggressiveness in order to protect their cherished labor republic.