Mugabe's calls for racial reconciliation failed to stem growing white emigration, while relations with Joshua Nkomo's Zimbabwe African People's Union (ZAPU) also deteriorated. In the Gukurahundi of 1982–1987, Mugabe's Fifth Brigade crushed ZAPU-linked opposition in Matabeleland in a campaign that killed at least 10,000 people, mostly Ndebele civilians. Internationally he sent troops into the Second Congo War and chaired the Non-Aligned Movement (1986–89), the Organisation of African Unity (1997–98), and the African Union (2015–16). Pursuing decolonisation, Mugabe emphasised the redistribution of land controlled by white farmers to landless blacks, initially on a "willing seller–willing buyer" basis. Frustrated at the slow rate of redistribution, from 2000 he encouraged black Zimbabweans to violently seize white-owned farms. Food production was severely impacted, leading to famine and economic decline which were exacerbated by Western sanctions. Opposition to Mugabe grew, but he was re-elected in 2002, 2008, and 2013 through campaigns dominated by violence, electoral fraud, and nationalistic appeals to his rural Shona voter base. In 2017, members of his party ousted him in a coup, replacing him with former vice president Emmerson Mnangagwa.