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The act barred federal courts from issuing injunctions to prevent strikes, picketing, or boycotts by labour groups and prohibited “yellow-dog” contracts. Previously, employers could, as a condition of employment, require employees to sign an agreement pledging that they would not join a union.
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The Labor Management Relations Act of 1947 better known as the Taft–Hartley Act, enacted June 23, 1947 is a United States federal law that restricts the activities and power of labor unions.