5.56mm
Since the murderers were never mentioned, they must have been from the Communist (Republican) side.
As soon as I read it, the first thing that entered my mind was which side did it. Certainly not the Abraham Lincoln Bde. whose members not too long ago, were seeking US Veteran status? I’m sure now that Obama is in power, he can decree them Veterans.
The Republicans did at times kill many of the clergy. I’m sure the Loyalist side also did, with their targeted village aerial bombings, via the Condor Legion. Amazing how Hollywood only glorified the Republicans, and afterwards the Russians with their famous movies, Mission to Moscow, and North Star and a couple of others. One or two with Paul Muni, and who would ever think of branding him as a Commie sympathizer? (LOL)