International Socialist Organisation (Zimbabwe) Tags: Political Party.The International Socialist Organisation (ISO) is a Trotskyist organisation in Zimbabwe. It is part of the International Socialist Tendency (IST) led by the British Socialist Workers Party. It produces a newspaper called Socialist Worker. formation year 1990-01-01T00:00:00+02:00 headquarter Harare ideology Socialism, Trotskyism international affiliation International Socialist Tendency Learn more... Loading...