An anti-xenophobia activist stands chain...An anti-xenophobia activist stands chained in front of a banner, as thousands of people get ready to march against the recent wave of xenophobic attacks in South Africa through the streets of Johannesburg CBD on April 23, 2015. President Jacob Zuma pledged to tackle xenophobia in South Africa as troops were sent in to support police in a crackdown against attacks on immigrants that have left at least seven people dead. AFP PHOTO/GIANLUIGI GUERCIAGIANLUIGI GUERCIA/AFP/Getty Images

An anti-xenophobia activist stands chain…An anti-xenophobia activist stands chained in front of a banner, as thousands of people get ready to march against the recent wave of xenophobic attacks in South Africa through the streets of Johannesburg CBD on April 23, 2015. President Jacob Zuma pledged to tackle xenophobia in South Africa as troops were sent in to support police in a crackdown against attacks on immigrants that have left at least seven people dead. AFP PHOTO/GIANLUIGI GUERCIAGIANLUIGI GUERCIA/AFP/Getty Images

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