 Bokamba-Yangouma joined the opposition shortly before the February–June 1991 National Conference, playing a key role in ending the PCT regime.He was the First Vice-President of the Higher Council of the Republic during the 1991–92 transitional period leading to multi party elections.Following the 1992 local elections, which were organized by the government of Prime Minister André Milongo and were widely criticized, Bokamba-Yangouma successfully worked to have Milongo's government deprived of its responsibility for organizing the subsequent parliamentary and presidential elections.