The US Civil Rights Movement is included in this introductory Section A because the movement, especially in the years from 1955-1963, has become an iconic example of the the role of nonviolent action, the range of methods available and its potential for success. Martin Luther King Jr is also one of the key leaders and theorists of nonviolent action. The challenges later posed by black power militants to adherence to nonviolence raised questions about the limits of nonviolent methods, for example in undermining entrenched socio-economic inequality, and the attractions of violence.