No major campaign has ever been successful without 'counterpower' - the power that the 'have-nots' can use to remove the power of the 'haves'. This is examined by investigating the history and tactics of the suffrage movement, the labour movement, the anti-war movement, the anti-colonial movement, the environmental movement and more. In the context of the financial crisis and the threat of climate change, engagement in system-critical social movements is on the increase. This unique book demystifies the power dynamics of social change.