A few weeks after the November 1918 armistice ended World War I, unions in Seattle's shipbuilding industry demanded a pay increase for unskilled workers. In an attempt to divide the ranks of the union, the yard owners responded by offering a pay increase only to skilled workers. The union rejected that offer and Seattle's 35,000 shipyard workers went on strike on January 21, 1919.
Controversy erupted when Charles Piez, head of the Emergency Fleet Corporation (EFC), an enterprise created by the federal government as a wartime measure and the largest employer in the industry, sent a telegram to the yard owners threatening to withdraw their contracts if any increase in wages were granted. The message intended for the Metal Trades Association, the owners, was accidentally delivered to the Metal Trades Council, the union. The shipyard workers responded with anger directed at both their employers and the federal government which, through the EFC, seemed to be siding with corporate interests.
The workers immediately appealed to the Seattle Central Labor Council for a general strike of all workers in Seattle. Members of various unions were polled, with almost unanimous support in favor–even among traditionally conservative unions. As many as 110 locals officially supported the call for a general strike to begin on February 6, 1919, at 10:00 am. Among the strikers were war veterans who wore their uniforms as they went on strike.<2>
http://en.wikipedia.org/wiki/Seattle_General_Strike