In his heyday, Carlo Tresca ranked among the most important radicals and labour activists in the United States, often sharing the spotlight with Elizabeth Gurley Flynn, 'Big Bill' Haywood, and Emma Goldman. A charismatic Italian anarchist who became a folk hero to immigrant and native-born workers alike, Tresca was described by comrades as a 'freelance revolutionary' because of his independent spirit and militant activism. During his wild and adventurous career spanning nearly forty years (1904-1943), Tresca pursued a range of activities unmatched by any of his radical contemporaries: independent newspaper editor, labour agitator and organizer, civil libertarian, foremost leader of the Italian American anti-fascist resistance, and an indomitable foe of Stalinism. Culminating over a decade of research, this fast-paced and vivid biography brings to life the volatile world of radical politics in early twentieth-century America through one of its foremost figures.