[4] Angami began his political life in 1951 when he resigned from his job as an office assistant to join the Naga National Council, an organisation that he went on to head as its president.
In 1957 T. N. Angami formed the Reforming Committee of the Naga National Council with the aims of opposing violence, winning over the rebels and restoring peace in Nagaland.
[6] Following a no confidence motion against the government, Ao resigned as Chief Minister and was succeeded by Angami who served from August 1966 to February 1969.
[7] As Chief Minister, he convened a Peace Mission and convinced the Government of India to take a more liberal view of the rebels and to grant them amnesty without preconditions.
[9] In the elections of 1969, the Naga Nationalist Organisation was voted back to power but Angami stepped down as Chief Minister and was succeeded by Hokishe Sema.