The Abraham Lincoln Brigade was fundamentally antiracist, and would have opposed Israeli theocracy, just as it had resisted the domination of the Spanish Catholic Church.
What has happened to turn the US Empire into a wanton killing machine in the Middle East? What possible geopolitical gain can come from murdering tens of thousands of young Palestinians? How did Israel turn into the Third Reich?
Does this sound like what Israel is doing to two million Palestinians today? Bombing them with US supplied high tech weaponry, and slaughtering their children with bunker busters and white phosphorus.