Zinn

"The power of government, whatever weapons it possesses, whatever money it has at its disposal, is fragile. When it loses its legitimacy in the eyes of its people, its days are numbered. We need to engage in whatever actions appeal to us. There is no act too small, no act too bold. The history of social change is the history of millions of actions, small and large, coming ­together at points in history and creating a power that governments cannot suppress."

Check out his essay in its entirety: Occupied Zones.