>>17913382
It's kind of situational I think and doesn't translate to the U.S. very well. Europe has this history where the centralizing tendencies for hundeds of years were around crown and church, while leftism could adopt a localist and regionalist character like the Basques. At least in Spain. There was a history preceding modern left/right distinctions going back to the Revolt to the Comuneros in the 1500s. Think of that Monty Python sketch:
https://youtu.be/R7qT-C-0ajI

I don't know a lot about Basque nationalism though. But you see this with Irish nationalism where they would fight the British while identifying with anti-colonial causes.

>>17913672
I tried to look those guys up once and apparently they were part of a Nasserist party:
https://en.wikipedia.org/wiki/Popular_Nasserist_Organization