This is a joint investigation with Bayerischer Rundfunk, L’Echo (Belgium), Le Monde (France), BNR (Netherlands). It is part of the “Databroker Files”. A German version of this article was published under the title „Datenhändler verkaufen metergenaue Standortdaten von EU-Personal“. There are detached houses with front gardens in an upmarket district of Brussels, and the political centre of the European Union is not far away.