John (Juan) Creaghe (1841-1920) turned his back on the chance of a prosperous medical career to live among the workers. He spent an extraordinary lifetime struggling for anarchism: fighting bailiffs and establishing the scurrilous Sheffield Anarchist, working in Argentina on La Protesta, (for years the main voice of the labour movement), and supporting the Mexican anarchist Magon brothers at the time of the Mexican revolution. Alan O’Toole’s biography rescues the story of this inspiring figure, assessing his worldwide agitation, showing his interactions with figures like William Morris and Edward Carpenter, and illuminating a large slice of Anarchism’s “heroic years.”