Definition: this name is given to political or social movement that attempts to mobilize its supporters on a widespread level, using local members or teams to organize its members

Answer: Grassroots

Grassroots movements and organizations use collective action from individuals and groups in the local level to cause change at the regional, national, or international level of politics. An example of a recent grassroots movement was the Bernie Sanders campaign in which the average campaign donation was about $27. Large organizations and corporations are not part of grassroots support.