English version

whispering campaign

From Longman Dictionary of Contemporary Englishwhispering campaignˈwhispering camˌpaign noun [countable]  CRITICIZEa situation in which someone privately spreads criticism about another person in order to make people have a bad opinion of them
Examples from the Corpus
whispering campaignIt was the Cloggy episode which started the whispering campaign.
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