I suppose most people regard the Suffragettes as the exemplary vindication of the right to carry out illegal direct action in a righteous cause. Speaking in support of Extinction Rebellion, Helen Pankhurst, a descendant of the Suffragette leader, said that both movements were equally ‘socially marginalised, made fun of, considered to be extremists, and legally silenced, and yet they stand up for justice in the way the Suffragettes did.