Tanzanian President John Magufuli’s deepening dispute with companies he accuses of being tax cheats is rattling investors and dimming the allure of one of Africa’s fastest-growing economies. Since taking office in late 2015, Magufuli has been on a drive to increase revenue from natural resources to help fund his industrialization plans. His administration has passed laws enabling it to renegotiate contracts and ordered foreign mining firms to sell stakes on the local stock exchange to increase transparency. The authorities have hit Acacia Mining with a $190-billion tax bill, curbed its exports and detained a senior employee, and seized gems and questioned staff from Petra Diamonds, alleging it hadn’t paid its dues.
