Cinergia has this excellent selection of information on films about the Spanish Civil War for teachers, scholars and cinephiles. Most of the films listed are feature films, but some documentaries are included. More here
In the image Andrés Pájares salutes out of fear in Ay Carmela by Carlos Saura
The site also has comprehensive notes in English and Spanish on using some of these films for teaching. Here
I’ve added a short biography of Helios Gómez, perhaps the best known gypsy artivist in the Spanish Civil War, and author of many Republican propaganda posters.
Audio interview with Paul Preston here on Canal Ser in Spanish about his book We Saw Spain Die about foreign journalists in the Spanish Civil War.
From review of We Saw Spain Die
In the minds of these correspondents, the quest for truth was not compromised but enhanced by commitment. This testament to their testimony could not have been supplied by a more erudite expert. Preston is a peerless historian of Spain, and the only one who writes as readably as a professional journalist.