His 1928 book The Universal Aspect of Fascism received some attention both in Italy and in Europe. Mussolini wrote the second edition's preface.
During World War II Barnes worked to publicise Fascist Italy. His own Fascist views included palingenesis, anti-Semitism, and opposition to liberalism. After the war he lived in Italy. On the idea of Fascism, he described:
Fascism may be defined generally as a political and social movement having as its objective the re-establishment of a political and social order, based upon the main current of traditions that have formed our European civilisation, traditions created by Rome, first by the Empire and subsequently by the Catholic Church.
↑James Strachey Barnes (20 November 2014). A British Fascist in the Second World War: The Italian War Diary of James Strachey Barnes, 1943–45. Bloomsbury Academic. p.1. ISBN978-1-4725-1042-6.
↑Jackson, P. (2014). James Strachey Barnes and the fascist revolution: Catholicism, anti-Semitism and the International New Order. In E. Tonning, M. Feldman, & D. Addyman (Eds.), Modernism, Christianity and Apocalypse (Vol. 8, pp. 187–205). (Studies in religion and the arts). Brill. Advance online publication. https://doi.org/10.1163/9789004282285_012