Campaigns will sometimes hire actors who pretend to be concerned citizens at corporate or government meetings where they present false testimonials.

"Astroturfing"

Explanation:

According to my research on political strategies, "Astroturfing" campaigns usually have actors providing false testimonials. Astroturfing are campaigns designed to hide sponsors and political organizations in order to make it look as though there are actual supporters for the campaign. Which then convince regular people to actually support the campaign after seeing the followers that it has.

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