the.com/whisper campaign

means An organized effort to damage someone's reputation by spreading negative rumors quietly, person to person, so the source can never be pinned down.

from Straightforward compound: 'whisper' for the hushed, deniable way the rumor travels mouth to ear, and 'campaign' borrowed from military and political strategy, suggesting a coordinated push rather than a stray bit of gossip. The phrase took hold in 20th-century American politics, especially used to describe covert smear tactics during election races, where damaging claims about a candidate spread through murmurs and insinuation rather than public statements anyone could be held accountable for.