Madrid wants to make the Assemblia Nacional de Catalunya illegal.
This happened to some political parties in the Basque region that had some tenuous (or not so tenuous, I don't know) ties to ETA.
The Assemblia Nacional?
They are getting people to sign a petition and got a whole lot of people to go and hold hands in support of Catalan independence.
Yeah, that's a scary group of people....
........unless of course you're afraid of democracy.