A number of employers tried to destroy the
craft unions that made up the AFL in the first decade of the twentieth century by insisting on maintaining an "open shop", i.e. hiring without reference to union membership. For craft unions, such as the Iron Workers, who maintained union wages and working conditions by controlling the supply of labor, the open shop meant that the employer was free to set any wage standards it chose and to discriminate against union members in hiring. The Iron Workers had successfully repelled the open shop demands of American Bridge Company (or "Ambridge"), an arm of the
United States Steel Corporation, in 1903. In 1905, after the union's
collective bargaining agreement with Ambridge had expired, Ambridge and the other members of the National Erectors Association began refusing to hire union members and hired
labor spies to infiltrate the union. When the Iron Workers struck in response, the employers obtained
injunctions and local ordinances that barred picketing or limited it to an ineffective display. Open shop demands still exist today. Non-union iron-working companies are in competition to take over union jobs, but the non-union hourly wage is based on the union rate.
Los Angeles Times bombing Between the years of 1908 and 1911, 87 to 150
bombings took place at work sites, including some bombs set up by union members. The
most famous one, and the only one to cause any loss of life, killed twenty employees of the
Los Angeles Times on October 1, 1910.
Times publisher
Harrison Gray Otis was a staunch opponent of labor unions, and the main supporter for the open shop movement in
Los Angeles. Authorities arrested James B. McNamara and Ortie McManigal in Detroit, carrying dynamite in a suitcase. Both men were in positions of importance in the Ironworkers Union. McManigal confessed to a number of dynamite bombings, and named the Secretary-Treasurer of the union, John J. McNamara, as the man who directed the bombings. James and Jim McNamara were brothers, and John gave James $1,000 per month from the union's treasury to finance the bombings. described the Ironworkers Union bombings as perhaps the largest
domestic terrorism campaign in American history, and further notes the
Los Angeles Times bombing and subsequent trials as marked a precipitous decline in labor union power in the Los Angeles area. ==Battles with the AFL, employers and the IWW==