Fabbri was a long time and prolific contributor to the anarchist press in Europe and later South America , including co-editing , along with Errico Malatesta , the paper `` L'Agitazione '' .
Fabbri was a long time supporter of to the anarchist press in Europe and later South America , including co-editing , with Errico Malatesta , the paper `` L'Agitazione '' .