There’s strong nationalist movement fighting for independence from Spain there. The nationalists took over the local government and a lot of local institutions (police, education, all sorts of associations and clubs). Fortunately so far they didn’t resort to terrorism like the Basques before them but they are often violent and illegally financed (defrauding public money, Russia is also supporting them). They promote internal divisions, discriminate people who don’t support independence and destabilize national politics. In the end it’s all about money. They basically want fiscal privileges at the cost of rest of Spain. They use revenue generated by Catalan businesses as one of their arguments so the best thing you can do is to not let your money flow there.