What Happened Tanzania's ongoing brush with foreign investment under President John Magufuli is encompassing a growing number of Chinese firms, individuals and entities. On Oct. 24, Tanzanian officials arrested four Chinese nationals overseeing efforts to build a canal and road in Dar es Salaam, citing the projects' slow progress. The detained contractors will allegedly continue to work during the day while spending each night at a police station until the governor of Dar es Salaam is satisfied with their progress. According to Tanzanian officials, the arrests were meant to serve as a warning to other foreign contractors in the country, illuminating Tanzania's increasingly poor investment and business climate under Magufuli's nationalist agenda. Why It Matters Since Magufuli took office in 2015, his attempts to increase Tanzania's share of revenue and control have spooked many Western investors.