Final answer:
The Taft-Hartley Act marked a shift in U.S. foreign policy regarding labor unions, restricting their rights and influence.
Explanation:
The passage of the Taft-Hartley Act in 1947 represented a significant shift in American foreign policy, specifically in relation to labor unions and their rights.
This act limited workers' rights to strike, boycott, and picket, and restricted labor unions from spending money in federal elections.
It was a response to the perceived communist leanings of some labor unions and aimed to control their influence on political and economic matters.
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