[3] Back in Congo-Brazzaville, he quickly attained a prominent place in the radicalized political scene of the period that followed the August 1963 ouster of Fulbert Youlou, and he started a magazine, Dipanda.
[10] He held a reception in Beijing on 15 August 1969 to mark the sixth anniversary of the revolution; various high-ranking Chinese officials, including Premier Zhou Enlai, attended.
[11] Along with various other prominent politicians, including Massemba-Débat and Pascal Lissouba, Ndalla was put on trial by President Marien Ngouabi in 1969 for involvement in the murder of government officials, but he was acquitted[12][13][14] on 21 November 1969.
Ndalla was one of the party's founding members; he was included in the PCT's original Political Bureau and was designated as First Secretary in charge of Organization,[15] in which capacity he was responsible for managing internal organizational matters.
[17] Student protests and a strike led Ngouabi to sideline the PCT's radical leftist leaders, who were associated with Maoism, in November 1971.
[4] Under Denis Sassou Nguesso, the M-22 was partially rehabilitated and regained influence[18][19] beginning in 1980, to the point that some M-22 figures were considered part of "the backbone" of the PCT regime.
The arrest of Ndalla was part of a series of successful moves by Sassou Nguesso in 1984, culminating in his victory over the Katali faction at the party congress.
[19] While in detention, Ndalla was recorded on video saying that Jean-Pierre Thystère Tchicaya, a key figure in the PCT regime, had orchestrated bomb attacks that occurred in Brazzaville in 1982.
During the June–October 1997 civil war, Ndalla objected to the MCDDI's moves toward an alliance with President Pascal Lissouba and defected to the side of Denis Sassou Nguesso and his rebel Cobra militia.
[31] The civil war ended in victory for the Cobras on 15 October 1997; Lissouba and Kolélas were ousted and Sassou Nguesso regained control of the country.
[31] When Sassou Nguesso formed a government on 2 November 1997, he appointed Ndalla as Minister of Youth Redeployment and Sports, in charge of Civic Instruction.
He was present for the launch of the support committee for Sassou Nguesso's candidacy on 6 February 2002, and on that occasion he elaborated his view that Sassou Nguesso was "a symbol of hope, peace and freedom" by symbolically assigning a positive characteristic to each letter of the name "Sassou", in French: "S is for security (sécurité), A is for joy (allégresse), S is for concern for others (souci des autres), S is for the salvage of the property of the people of Mfilou (sauvetage des biens des gens de Mfilou), O is for organizer of peace (organisateur de la paix), and U is for national unity (unité nationale)".
[40] On 1 October 2008, Ndalla participated in the founding of the Convention for the Rebirth of Congo (CRC),[41][42] a pro-Sassou Nguesso political grouping that was created through an agreement signed by five parties, eight associations, and nine individuals.
A dedication ceremony for his works was held on 9 March 2006 in the presence of various literary and academic features, including the foremost Congolese poet, Jean-Baptiste Tati-Loutard.