In the late 1960s Tanzania's first post-independence president, the charismatic Julius Nyerere, believed that endemic poverty in rural areas could only be addressed if peasant farmers relocated to larger villages and worked collectively. It was part of a new experimental form of socialism, known as Ujamaa. In 2016 Rob Walker spoke to two Tanzanians who remember it well. This programme is a rebroadcast. Photo: Tanzanian women cultivating the soil (AFP/Getty Images)