 The group's name is inspired by Karl Popper's 1945 book "The Open Society and Its Enemies".The OSF has branches in 37 countries, encompassing a group of country and regional foundations, such as the Open Society Initiative for West Africa, and the Open Society Initiative for Southern Africa; its headquarters are in New York City.In 2018, OSF announced it was closing its European office in Budapest and moving to Berlin, in response to legislation passed by the Hungarian government targeting the foundation's activities.