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Definition of McCarthyism noun from the Oxford Advanced American Dictionary

 

McCarthyism

 noun
noun
NAmE//məˈkɑrθiˌɪzəm//
 
[uncountable]
 
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an aggressive investigation during the 1950s against people in the U.S. government and other institutions who were thought to be communist, in which many people lost their jobs
See the Oxford Advanced Learner's Dictionary entry: McCarthyism