a global network of volunteer helpers. They were the bankers who supplied Office agents with cash in emergencies; the doctors who treated them in secret when they were wounded; the hoteliers who gave them rooms under false names, and the rental car agents who supplied them with untraceable vehicles.
this is from a paragraph of a novel i am reading now. two agents are involved in an investigation. this information comes up. one of them was once involved in this global network of volunteer helpers. reading this, i become aware that every global intelligence needs such a global network. let me be more accurate, even a regional intelligence needs such a network to operate successfully in a region. those who are not spies can help a lot by doing small jobs, as described in the paragraph. and more. ships that would go away quietly at midnight, smuggling someone out to a distant shore or port. you don't have to pay for these helpers. they know what they are doing and why.