There are the Linux Foundation certs, some of which (e.g. Certified Sysadmin) are well respected, relatively hard to get, and also very expensive. There are some cheap and some free ones as well, but I don't know if recruiters care about them at all. They are just a formal way of showing 'I know ' instead of you just saying it after all.
Depending on your domestic laws you may be able to deduct them from tax, or even get some kind of government subsidy for doing them. I would look into that if you wanna go after the really expensive ones.
There is also Red Hat, I don't know if those are worth it thought. Probably not the worst to have either.
I can easily continue, because our cops get proper training and don't kill thousands of people a year.
Political gatherings are protected by law and police exists to enforce the law. As long as no court declares the party illegal, it's their job to ensure they can gather, because they are a party. Same goes for all other parties.