[k-mcgrady]

I don't know much about Catalonia so have no idea about the bias BUT you're right that the users submissions are ALL related to the one political topic. I don't know about banning them but maybe banning submissions from them? It's essentially spam. Politics here usually has a tech angle and occasionally some political articles with no tech angle are relevant just because they are interesting but posting only political articles on a topic that will effect very few people on HN is spam.