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Seven of the sixteen American railroad labor organizations staged a nationwide strike (striking workers pictured) that lasted two months.

List of American railway unions

The following is a list of unions and brotherhoods playing a significant role in the railroad industry of the United States of America. Many of these entities changed names and merged over the years; this list is based upon the names current during the height of American railway…
Source: Wikipedia (CC BY-SA)

Great Railroad Strike of 1922

1922 nationwide railroad workers' strike in the US

The Great Railroad Strike of 1922, or the Railway Shopmen's Strike, was a nationwide strike of railroad workers in the United States. Launched on July 1, 1922, by seven of the sixteen extant railroad labor organizations, the strike continued into August before collapsing. A…
Source: Wikipedia (CC BY-SA)