The Union for Democracy and Social Progress is a major political party in the Democratic Republic of the Congo. Founded in 1982, amid the one-party rule of Mobutu Sese Seko and his Popular Movement of
Left to right: parliamentarians Mpinga Makanda, Étienne Tshisekedi, Joseph Ngalula, and Isidore Kanana Tshiongo a Minanga, detained by Mobutu