Interest groups that are made to look like "grassroots" groups, but are really created by a larger interest group to create the illusion of grassroots support, are called

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Astroturf groups are designed to appear as though they are driven by grassroots participation when, in fact, they are orchestrated by larger, often corporate, interest groups to simulate widespread public support for their agendas.

Interest Groups That Are Made to Look Like "Grassroots" Groups