[1] He served as Minister of Middle Classes in Lumumba's government, which was officially invested by Parliament on 24 June 1960.
[5] Belgian Ambassador to the Congo Jean van den Bosch established a confidential line of contact with Mbuyi, since he was regarded as more politically moderate than some other members of the government.
[6] Throughout August Lumumba increasingly withdrew from his full cabinet and instead consulted officials and ministers he trusted, including Mbuyi.
[7] On 5 September President Joseph Kasa-Vubu announced the dismissal of Lumumba, along with several of his ministers and declared that a new government would be formed.
[8] A political deadlock ensued, and on 14 September, Colonel Joseph-Désiré Mobutu launched a coup to install his own government.