A mass strike by members of South Africa's engineering profession threatens to take a heavy toll on the health of the country's economy.

Members of the National Union of Metalworkers of South Africa (NUMSA) have launched a nation-wide strike following the breakdown of last-minute wage discussions with employers. NUMSA is South Africa’s biggest union, with more than 220,000 members servicing the construction and engineering sectors of sub-Saharan Africa’s biggest economy. The union announced that it would stage marches in several of…