"The working class and the employing class have nothing in common." –IWW Preamble, 1905
Bourseiller’s book is the only one in existence, in any language, that attempts to treat the history of the ultra-left in its entirety.
Since 1988, interest in the work of Amadeo Bordiga has only increased, and seems on its way to eclipsing (hopefully with happier results) the earlier 1960s/1970s fascination with Antonio Gramsci.
Bordiga was the last Western revolutionary who told off Stalin to his face as the gravedigger of the revolution, and lived to tell the tale. He is one of the most original, brilliant and utterly neglected Marxists of the century.