Anti-immigrant protesters march in Johannesburg on Thursday after the passing of an unofficial June 30 deadline set for undocumented migrants to leave South Africa. File Photo: Oupa Nkosi/Reuters Anti-migrant protests are continuing across South Africa, with humanitarian groups and regional countries on alert as vigilantes search for undocumented migrants. On Thursday, anti-migrant activists in Johannesburg went door-to-door in search of people living in the country without permission,...