You can become an "hacktivist" by taking 15 minutes of your time to write an email to your MEP.

https://www.europarl.europa.eu/meps/en/home

I think "hacktivist" here means hacking into the politician's inboxes and leaking the contents, like "politicians want to do this to you; let's see how they like it when it's done to them" sort of thing.