Grassroots Activism
"Grassroots organizing refers to the practice of community groups and/or organizations bringing people together to identify and solve social problems that have an impact on the communities that they belong to and/or care about. Grassroots organizing is different from other forms of organizing in that the impetus for action most often emerges from the “bottom-up” and involves regular people, in contrast to “top-down” approaches where the organizing is managed by people and organizations in positions of power."
The SAGE Encyclopedia of Out-of-School Learning
See the TEDx Talk below, given by high schooler Elise Atkins-Louis, for an example of grassroots activism, and the power this kind of organization can hold.