Max Nettlau was the most proficient, and still is the most important, chronicler of anarchism. This one volume (at 400 pages) introduction to the history of anarchist ideas and early movements, summarising the author's monumental 9-volume history and several biographies, is the most reliable guide.
It was in prison in 1911 that Peter Arshinov established a close personal and political friendship with Makhno, which continued after their release following the February Revolution in 1917. In 1919 Arshinov became Makhno's secretary, and remained with the Makhnovists until 1921. Arshinov's history of the Makhnovists is undoubtedly the most important...
Kropotkin and the Anarchist Intellectual Tradition rescues Peter Kropotkin's philosophy of anarchism from the neglect that it has suffered in mainstream histories of the social and environmental sciences.
Radical Unionism The Rise and Fall of Revolutionary Syndicalism by Ralph Darlington. Though often seen as opposing ideas, Darlington engagingly traces the entwined legacy of revolutionary syndicalism and the communist movement.