A member of the Congolese Labour Party (PCT), he served in the Senate of Congo-Brazzaville from 2002 to 2012.
[1] During the single-party regime of the PCT, Ntsiété was a member of the Revolutionary Court of Exception.
[3] Years later, in July 2002, Ntsiété was elected to the Senate as a PCT candidate in Brazzaville.
He received the votes of 58 electors, placing first and therefore winning the first of Brazzaville's six available seats.
[9] He headed the local PCT committee in Bacongo at the time of the election.