The Greek Drug & Substitute Users Union is the only organisation advocating for drug users' rights in Greece. The Union mostly focus their activities in Athens, where the majority of harm reduction services are based, and also where ministries and policy makers express their views. Athens is also the city where most people who use drugs are concentrated. However, the Union has members in most cities of the country, incuding the Greek islands. The Union negotiates regularly with the government on OST provision, and participated in open discussions around the Greek national drug strategy and action plan 2014-2016.