In Port Harcourt, he joined the local affiliate of the Ibo Federal Union and also began to study for the London Matriculation which he passed in 1943.
Between 1943 and 1947, Ajegbo was a law student at London University, shortly after passing the bar in 1947, he returned to Nigeria and settled in Onitsha.
[1] As a lawyer, Ajegbo was involved in the nationalist movement, in 1948, he defended Onitsha branch members of the Zikist Movement against charges brought by the colonial government, a year later, he was an attorney representing the coal miners union of Enugu in a judicial commission of inquiry into a shooting incident of miners in Enugu.
[1] Ajegbo became a Vice-President of the newly formed Ibo State Union in 1948 and was an active member of the settlers association in Onitsha.
The council later-on initiated the construction of the Onitsha Market funded by a loan from the regional development board.