Criminal syndicates around South Africa are forcing businesses to pay large sums of money each month as a “protection fee”, and some of these businesses are having to shut down as a result. How can we turn the tide against extortionists? Lester Kiewit speaks to Santiago Uribe Rocha, the Chief Resilience Officer of Medellín in Colombia, once regarded as the most violent city in the world, but which has turned things around in a relatively short period of time.