Born in Fabriano (Ancona), Italy 1877, died in Montevideo, Uruguay 1935; anarchist militant and writer; first sentenced for anarchist activities at the age of 16 in Ancona; shortly afterwards he began contributing to the anarchist press (Il Pensiero, La Protesta Umana, L'Avvenire Sociale), mostly under his pseudonym Catilina; one of the editors, beside Errico Malatesta, of L'Agitazione 1897-1898 until his arrest in May 1898; imprisoned until October 1900; went to Rome and resumed publication of L'Agitazione; founded in 1903 with Pietro GoriIl Pensiero, which was to last until 1913 and which remains one of the most important Italian anarchist periodicals; delegate to the International Anarchist Congress held in Amsterdam in 1907; contributed to and at one point edited Volontà 1913-1915; after the war, he refounded Volontà 1919-1920; contributed to and eventually became one of the editors of Umanità nova 1920-1922 and Pensiero e Volonta 1924-1926; went into exile in 1926, first to Paris, where he published La Lotta Umana 1927-1929; expelled from France, he went to Belgium and finally to South America, where he settled in Montevideo, Uruguay; there he started publishing Studi Sociali, continued by his daughter Luce after his death in 1935; among his publications are 'Carlo Pisacane' 1904, 'Lettere ad una donna sull'anarchia' 1905, 'Lettere a un socialista' 1914 and 'Malatesta: su vida e su pensamiento'.

Papers received by the IISH from V. Munoz in 1970, see Annual Report IISH 1970, p. 15; with accruals by a.o. Luce Fabbri in 1975 (see Annual Report IISH 1975, p. 33), 1985 and 1995.

Personal documents; diary 1915; letters from prison 1894-1895, 1897-1900; correspondence, primarily incoming letters; handwritten and typed manuscripts of books, articles and translations by Fabbri, and some notes; manuscripts by others; clippings of articles by Fabbri; press clippings primarily from Italian newspapers on the First World War, the Russian Revolution, anarchists and war, fascism etc.; circulars; some leaflets, mainly from Italy; reports and notes from the Second and Third Congress of the Unione Anarchica Italiana 1920-1921; other documents; documentation (1872-) 1880-1935.

Papers of others: manuscripts by Malatesta 1889-1890, 1892 and n.d.; manuscripts by Berzuglia 1929.

Inventory made by Amanda Elsinghorst of the parts received in 1975 (nos. 1-26), 1985 (nos. 27-50) and 1996 (nos. 51-361)