Photograph of a protest march along Broadway in downtown Los Angeles, featuring picketers from labor unions denouncing the Taft-Hartley bill. Two marchers carry a sign with the words "All labor, all progressive A. F. of L., Railroad Brotherhood, C.I.O., Join to fight the Taft-Hartley Slave Bill." Despite the protests, the bill was adopted, and the Labor Management Relations Act (commonly known as the "Taft-Hartley Act") became law in 1947. The law posed numerous restraints on trade unions, including a well publicized clause requiring all union officers to sign oaths that they were not Communists. The law also banned mass picketing and secondary boycotts, abolished the union closed shop, and authorized employers to interfere in workers' attempts to join a union.
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