The movement for the independence of Catalunya is a primarily a project of the rancid, lunatic left-wing fringe. It’s greatest champions are the likes of Anna Gabriel of the CUP and Junts Pel Si. If you Google her and these two organizations you’ll see what I mean.
Sounds like the Communists who took over the Spanish Republican faction are feeling their oats again. Of course, there are differences today - no Russian backing (yet) for the Commies. And it’s unclear what today’s castrated Spanish Commies would do with weapons.