have returned to South Africa from foreign work assignments over a five-year period from 2008 to 2013. This was catalysed by the global financial crisis of 2007–8 and perceptions of higher quality of life in South Africa relative to the countries from which they first emigrated to. It is estimated that around 37% of those returning are professionals such as lawyers, doctors, engineers and accountants. Immigration Refugees from poorer neighbouring countries include many immigrants from the Democratic Republic of the Congo, Mozambique, Zimbabwe, Malawi and others, representing a large portion of the informal sector. With high unemployment levels amongst poorer South Africans, xenophobia is prevalent and many South Africans feel resentful of immigrants who are seen to be depriving the native population of jobs, a feeling which has been given credibility by the fact that many South African employers have employed migrants from other countries for lower pay than South African citizens, especially in the construction, tourism, agriculture and domestic service industries. Illegal immigrants are also heavily involved in informal trading. However, many immigrants to South Africa continue to live in poor conditions, and the South African immigration policy has become increasingly restrictive since 1994. Trade unions Since 2007 the South African unions representing public sector workers recurrently went on strike, demanding pay rises significantly above inflation, in a practice that some experts argue is suppressing job growth, harming millions of South Africans who are out of a job. In August and September 2010, South African unions organised a crippling four-week national strike involving 1.3 million public sector workers, demanding an 8.6% wage increase. The strike ended after the government had raised its 5.2% wage increase to 7.5%. The deal swelled state spending by about 1%. Protesters sought to block hospitals, and South African media have reported numerous acts of violence against health and education staff who insisted on going to work. Volunteers and army medics were called in to help at hospitals, and some patients were moved to private medical facilities. There is a persistent wage differential between unionised and non-unionised workers in South Africa, suggesting that unions are keeping wages higher for their members, thereby posing additional challenges to the unemployment problem. In July 2014, amidst a national strike by 220,000 metalworkers, General Motors temporarily shut down its vehicle assembly plant, frustrating its plans to build 50,000 cars a year in the country. "The ongoing labour disruptions are