Belgrade, the capital of SFR Yugoslavia and SR Serbia, hosted the first Non-Aligned Movement Summit in September 1961, as well as the first major gathering of the Organization for Security and Co-operation in Europe (OSCE) with the aim of implementing the Helsinki Accords from October 1977 to March 1978. The 1972 smallpox outbreak in SAP Kosovo and other parts of SR Serbia was the last major outbreak of smallpox in Europe since World War II.