My scholarly friend Richard Michaelis has been reminded by the recent TLS article by Susan Sontag on Victor Serge, of the Bonnot Gang an anarcho-criminal outfit that terrorised France in 1911 - 2, using murder, violence and, for the first time, get-away cars. You can read about them here. (Serge was convicted in connection with the gang's activities. He was not actually a member, but he refused to tout).
The reference to them in George Woodcock's classic 1962 account of anarchism is rather brief:
On the fringe of the movement, and particularly in the individualist faction which became relatively strong after 1900 and began to publish its own sectarian paper, L'Anarchie ( 1905-14), there were groups and individuals who lived largely by crime. Among them were some of the most original as well as some of the most tragic figures in anarchist history. The gang led by Marius Jacob operated successfully for five years, from 1900 to 1905, carrying out hundreds of robberies and priding itself on robbing only the unproductive. But there was also the much more sinister Bonnot gang of neo-Stirnerite individualists, who in 1913 embarked on a career of large-scale banditry; most of its members died in gun battles with the police.
I gather than there is a chapter, however, in Richard Parry's, The Story of the French Illegalists ( London: Rebel Press, 1987).
Richard is interested in researching this episode - which has resonances for our own time, as well as clear particularities for the society from which it sprang - so any leads that readers might wish to post would be most welcome.