Poor People's Campaign

https://en.wikipedia.org/wiki/Poor_People%27s_Campaign

The Poor People's Campaign was a 1968 effort to gain economic justice for poor people in the United States. It was organized by Martin Luther King, Jr. and the Southern Christian Leadership Conference, and carried out under the leadership of Ralph Abernathy in the wake of King's assassination.
The Campaign demanded economic and human rights for poor Americans of diverse backgrounds. After presenting an organized set of demands to Congress and executive agencies, participants set up a 3000-person tent city on the Washington Mall, where they stayed for six weeks.