The Spanish workers' struggle would rouse you from your sleep, rouse you to the horror of reality, rouse you to a realisation of the blood and crime and hopeless misery of capitalism. With closed fists only the anarchists and syndicalists of Spain first walked down the enemy, Fascism.
Source, in full
"The United Front", fourth of seven speeches published by the Bellshill Speaker over the Barcelona Radio (12 March – 16 April 1937) and reprinted together as a penny broadside by Guy A. Aldred in Glasgow (1 May 1937). Facsimile reproduction, slightly reduced, in The Word, Mightier than the Sword, vol. 23, no. 6 (April 1962), p. 51