Papers mainly received as editor of Il Risveglio/Le Réveil: c.100 letters from Errico Malatesta 1913-1932; a few letters from Erasmo Abate (alias Hugo Rolland) 1925, Armando Borghi 1925, 1929, Gustave Brocher 1930, Luigi Fabbri 1925, Otello Gaggi 1936-1937, Jean Grave 1915, 1925, James Guillaume 1906, 1910-1912, Georges Herzig 1912, 1915, Alexandre Levandovsky c.1929-1932, Max Nettlau 1924, 1929-1933, Pietro Montasini 1934-1936, Bartolomeo Vanzetti 1926-1927, Théodore Vaskovitch 1925 and n.d., Jean Wintsch 1912, 1914 and others; file of letters from Malatesta to Giuseppe and Peppino Tosca, Randolfo Vella and others 1923-1932; handwritten and stencilled copy of a charge against Bertoni c.s. for plotting bombing attacks in Italy with explosives obtained from the German army during the First World War 1919; notes on his study of the Russian language n.d.; some documents relating to his visit to Moscow in 1921; some manuscripts of articles by Malatesta and others 1922 and n.d.; files of documents relating to the Spanish Civil War 1936-1939; some documents from anarchist and syndicalist organizations in Italy 1938-1939, Switzerland 1908, 1939-1942 and from Italian anarchist organizations in the USA 1938-1939; press clippings. NB. Part of his papers has been lost during the Second World War.