I once worked in a 'dissident' org (supported by the US Agency for International Development) - these orgs were fighting for human rights in their countries. In one extreme case/country, my prospective project team mate, no one knew her real name (came to know this later), though she was our colleague, was quite social and pleasant. In her country's expatriate circles in DC, she was worried about foreign spies. Family back home is at risk, and so is she, even if she lives in DC. These are brave people.
She wanted to build a database of something, and we were like, "keep your phone in another room" if you want to come discuss. Something that I am not sure she practices but more people need to practice.
CitizenLab is doing yeoman's service for people's rights to privacy and human rights. They're heroes.