In the 1930s Spain became a focus for pacifist organisations including the Fellowship of Reconciliation and the War Resisters' International whose president was the British MP and Labour Party leader George Lansbury. Prominent Spanish pacifists such as Amparo Poch y Gascón and José Brocca supported the Republicans in the Spanish Civil War.  Brocca argued that Spanish pacifists had no alternative but to make a stand against what he viewed as fascism. He put this stand into practice by various means including organising agricultural workers to maintain food supplies and through humanitarian work with war refugees.
- Bennett, Scott H. (2003) Radical Pacifism: The War Resisters League and Gandhian Nonviolence in America, 1915-1963, Syracuse NY, Syracuse University Press, ISBN 0-8156-3028-X.
- Brown, Herbert Runham (1937) Spain: A Challenge to Pacifism, London, War Resisters' International/ The Finsbury Press.
- Hunter, Allan A. (1939) White Corpuscles in Europe (foreword by Aldous Huxley), Chicago and New York, Willett, Clarke and Company.
- Prasad, Devi (2005) War is a Crime Against Humanity (foreword by George Willoughby), London, War Resisters' International, ISBN 0-903517-20-5.