Tread cautiously here if you're going to strike. I'm not a lawyer so take this just as a heads up, but Spanish law is tricky in this regard so get informed before risking your job. As per the Ministry of Work and Social Economy it is illegal to strike for 'political reasons, solidarity or support' ('Son ilegales las huelgas por motivos políticos, las de solidaridad o apoyo...'), on top of this you can be not permitted to strike for many other reasons. Pretty fascist I know but what we want is fewer people starving and homeless not more.
Edit: Looked it up, this one's legal (at the time of this comment).