1934 West Coast Longshore Strike

The 1934 West Coast Waterfront Strike (also known as the 1934 West Coast Longshoremen's Strike, as well as a number of variations on these names) lasted eighty-three days, triggered by sailors and a four-day general strike in San Francisco, and led to the unionization of all of the West Coast ports of the United States.

The San Francisco General Strike, along with the 1934 Toledo Auto-Lite Strike led by the American Workers Party and the Minneapolis Teamsters Strike of 1934 led by the Communist League of America, were important catalysts for the rise of industrial unionism in the 1930s, much of which was organized through the Congress of Industrial Organizations.

Longshoremen on the West Coast ports had either been unorganized or represented by company unions since the years immediately after World War I, when the shipping companies and stevedoring firms had imposed the open shop after a series of failed strikes. Longshoremen in San Francisco, then the major port on the coast, were required to go through a hiring hall operated by a company union, known as the "blue book" system for the color of the membership book.

The Industrial Workers of the World had attempted to organize longshoremen, sailors and fishermen in the 1920s through their Maritime Workers Union. Their largest strike, the 1923 San Pedro Maritime Strike, bottled up shipping in that harbor, but was crushed by a combination of injunctions, mass arrests and vigilantism by the American Legion. While the IWW was a spent force after that strike, syndicalist thinking remained popular on the docks. Longshoremen and sailors on the West Coast also had contacts with an Australian syndicalist movement that called itself the "One Big Union" formed after the defeat of a general strike there in 1917.